2022年考博英语-中国农业科学院考试内容及全真模拟冲刺卷（附带答案与详解）第2期

2022年考博英语-中国农业科学院考试内容及全真模拟冲刺卷（附带答案与详解）1. 单选题The history of Lis career took its special course because it occurred at the end of imperial times, when institutional problems of traditional Chinese history became（ ）new elements brought in by the impact of the West.问题1选项A.togetherB.separatedC.unitedD.merged with【答案】D【解析】考查形容词词义以及固定搭配辨析。A选项together“新潮的，情绪稳定的”；B选项separated“分开的，分居”；C选项united“一致的，统一的”；D选项merged with“与结合；与联合”。merged with与融合，结合，由题干可知，中国传统以及西方新元素会产生融合。排除A选项，B选项；空格处前是become，后面是new elements，宾语，根据语法结构，不能直接在空格处加入形容词，代入C选项无法组成完整的句子，不符合语法结构，空格处填入的词应和become一起构成谓语。句意：当中国传统历史的体制问题与在西方影响下引入的新元素相时，由于处于帝国时期的末期，李的职业历史便走向了一条特殊的道路。因此D选项正确。2. 单选题The rear section of the brain does not contract with age, and one can continue living without intellectual or emotional faculties.问题1选项A.advancedB.growingC.frontD.back【答案】D【解析】考查形容词辨析。rear在句中是后面的，后方的；A选项advanced“高级的，先进的”；B选项growing“成长的”；C选项front“前面的”；D选项back“后面的”。句意：大脑后部不会随着年龄的增长而收缩，一个人可以在没有智力或情感能力的情况下继续生活。因此只有D符合。3. 单选题The unfortunate death of the genius poet caused（ ）loss to this country.问题1选项A.pricelessB.countlessC.incalculableD.imaginable【答案】C【解析】考查形容词辨析。A选项priceless“无价的”；B选项countess“无数的，数不尽的”；C选项incalculable“不可计算的”；D选项imaginable“可想象的”。句意：那位天才诗人的不幸死亡给国家带来了不可计算的损失。结合句意，只有C选项符合。4. 单选题Before the disastrous earthquake there was（ ）chaos.问题1选项A.massiveB.ominousC.suspendingD.imminent【答案】A【解析】考查形容词辨析。A选项massive“巨大的，大量的”；B选项ominous“预兆的，不吉利的”；C选项suspending“暂停，延缓”；D选项imminent“即将发生的，临近的”，句意：在灾难性的地震发生之前，发生了大规模的混乱。结合句意，只有A选项符合。5. 单选题The Ever Victorious Army served as an (a)（ ）to the poorly organized, poorly trained, and poorly disciplined provincial forces of the governor.问题1选项A.serviceB.helpC.adjunctD.extension【答案】C【解析】考查固定搭配。A选项service“维修，检修”；B选项help“帮助”；C选项adjunct“附属的”；D选项extension“拓展”。adjunct to“附属于，部下”，为固定搭配。help to在这里不符合题干内容，可排除。句意：常胜军队组织欠妥、训练不足、纪律不严的政府地方部队。因此C选项正确。6. 单选题Aircraft and rocket can be used to collect radioactive debris, while high-altitude satellites carry detectors for gamma rays and other emissions.问题1选项A.diffusionB.remainsC.glitterD.transfer【答案】B【解析】考查名词辨析。debris表示“碎片，残骸”。A项diffusion“扩散，传播”，B项remain“遗留，残骸”，C项glitter“闪光，灿烂”，D项transfer“转移”。句意：飞机和火箭可以用来收集放射性碎片，而高空卫星携带探测伽马射线和其他辐射的探测器。根据句意，该题选B正确。7. 不定项选择题Motorola Inc., the worlds second-largest mobile phone make, will begin selling all of the technology needed to build a basic mobile phone to outside manufacturers, in a key change of strategy. The inventor of the cell phone, which has been troubled by missteps compounded by a recent industry slump in sales, is trying to become a neutral provider of mobile technology to rivals, with an eye toward fostering a much larger market than it could create itself. The Chicago area-based company, considered to have the widest range of technologies needed to build a phone, said it planned to make available chips, a design layout for the computer board, software, development tools and testing tools. Motorola has previously supplied mobile phone manufacturers with a couple of its chips, but this is the first time the company will offer its entire line of chips as well as a detailed blueprint. Mobile phones contain a variety of chips and components to control power, sound and amplification. Analysts said they liked the new strategy but were cautious about whether Motorolas mobile phone competitors would want to buy the technology from a rival.The company, long known for its top-notch（等级）engineering culture, is hoping to profit its mobile phone technology now that the basic technology to build a mobile phone has largely become a commodity. Motorola said it will begin offering the technology based on the next-generation GPRS (Global Packet Radio Service) standard because most mobile phone makers already have technology in place for current digital phones. GPRS offers faster access to data through “always on” network connections, and customers are charged only for the information they retrieve, rather than the length of download.Burgess said the new business will not conflict with Motorolas own mobile phone business because the latter will remain competitive by offering advanced features and designs. Motorolas phones have been criticized as being too complicated and expensive to manufacture, but Burgess said Motorola will simplify the technology in the phones by a third. In addition to basic technology, Burgess said, Motorola would also offer additional features such as Bluetooth, a technology that allows wireless communications at a short distance, and Global Positioning System, which tracks the users whereabouts, and MP3 audio capability.41. The word “slump” in the first paragraph may be replaced by（ ）.42. According to this passage, Motorola Inc.（ ）.43. Analysts dont think that（ ）.44. The technology supplied by Motorola is based on（ ）.45. Which of the following statements is NOT true?问题1选项A.slouchB.declineC.increaseD.stamp问题2选项A.is the worlds largest mobile phone makerB.is trying to become a mobile technology provider besides being a mobile phone makerC.will only sell chips of the mobile phonesD.is going to sell all its manufacturing plants问题3选项A.Motorola will be successfulB.the technology offered by Motorola will be selected by its competitorsC.its competitors will want to buy the technology from itD.its mobile phones contain a variety of chips问题4选项A.Bluetooth featuresB.MP3 audio capabilityC.Global Positioning SystemD.GPRS standard问题5选项A.GPRS offers faster access to data through network connections, so customers should pay more.B.Motorola Inc. is the inventor of the cell phone.C.Previously Motorola only supplied mobile phone manufacturers with some of its chips.D.Motorola Inc. is known for its high-class engineering culture.【答案】第1题:B第2题:B第3题:C第4题:D第5题:A【解析】41.【试题答案】B【试题解析】词义辨析题。Slump “消沉、衰退、（物价）暴跌”，A选项slouch“懒散”； B选项decline “下降，衰落，消沉”；C选项increase “上涨，增加”，所以slump可以用B代替。42.【试题答案】B【试题解析】细节事实题。定位到第一段第四句is trying to become a neutral provider of mobile technology to rivals（试图成为竞争对手移动技术的中立供应商）以及最后一段第一句Burgess said the new business will not conflict with Motorolas own mobile phone business（伯吉斯表示，新业务不会与摩托罗拉自己的手机业务发生冲突），所以B项“正在努力成为一个移动技术提供商以外的移动电话制造商”正确。A选项定位到第一段开头Motorola , the worlds second-largest mobile phone make（摩托罗拉是世界第二大移动电话生产商），所以A项“最大的生产商”错误；从第一段倒数第四行but this is the first time the company will offer its entire line of chips as well as a detailed blueprint.（但这是该公司首次提供完整的芯片系列以及详细的蓝图）可知C选项“只卖手机芯片”错误；D选项“将出售所有的制造厂”文中并没有提及，所以排除。43.【试题答案】C【试题解析】观点态度题。题目：分析学家认为不。第一段最后一句Analysts said they liked the new strategy but were cautious about whether Motorolas mobile phone competitors would want to buy the technology from a rival （分析家说他们喜欢这一策略，但是对于竞争者是否会愿意从竞争对手手中购买技术这一问题持谨慎态度），C项“竞争者们想要从摩托罗拉购买这项技术”，符合题意。A项“摩托罗拉会成功的”；B项“摩托罗拉提供的技术将由竞争对手选择”；D项“它的手机里有各种各样的芯片”都不符合题干。44.【试题答案】D【试题解析】细节事实题。从第二段第二句话Motorola said it will begin offering the technology based on the next -generation GPRS (Global Packet Radio Service) standard（摩托罗拉表示，将开始提供基于下一代GPRS（全球分组无线业务）标准的技术）可知D选项“GPRS标准”正确。A项“蓝牙功能”；B项“MP3音频功能”；C项“全球定位系统”文中均没有提及。45.【试题答案】A【试题解析】主旨大意题。从第二段最后一句GPRS offers faster access to data through always on network connections, and customers are charged only for the information they retrieve，rather than the length of download.（GPRS通过网络连接提供了更快的数据访问速度，客户只需按他们检索的信息收费，而不是下载的长度）可知顾客的付费应该是少了，而不是多了，所以A项“GPRS通过网络连接提供更快的数据访问，因此客户应该支付更多的费用”错误，符合题意；从第一段第二句开头The inventor of the cell phone（手机的发明者）可知B项“摩托罗拉公司是手机的发明者”正确；从第一段倒数第六行Motorola has previously supplied mobile phone manufacturers with a couple of its chips（摩托罗拉此前曾向手机制造商提供过几款芯片）可知C项“摩托罗拉过去只向手机制造商提供部分产品它的芯片”正确；从第二段开头The company, long known for its top-notch engineering culture（这家公司长期以来以一流的工程文化而闻名）可知D项“摩托罗拉公司以其一流的工程文化而闻名”正确。8. 单选题I didnt know it then, but this disruptive way of reading started with the very first novel I ever picked up.问题1选项A.harmfulB.persistentC.interruptiveD.characteristic【答案】C【解析】考查形容词辨析。disruptive在句中是“破坏性的，扰乱性的”；A选项harmful“有害的”；B选项persistent“持久稳固的”；C选项interruptive“中断的，阻碍的”；D选项characteristic“有特征的”，句意：我当时不知道，但这种颠覆性的阅读方式始于我捡到的第一本小说。因此只有C项符合。9. 单选题The day was breaking and people began to go to work so the murderer was unable to（ ）of the body.问题1选项A.dispenseB.disposeC.discardD.discharge【答案】B【解析】考查动词辨析。A选项dispense“分配，分发”；C选项discard“丢弃，抛弃”；D选项discharge“卸货，放出”。句意：因为天亮了人们开始去上班，所以凶手无法处理尸体。此外，dispose与of为固定搭配，意思是“处置，处理”。所以只有B选项符合。10. 单选题On the local level, tradition,（ ）through customs, rituals, education, and the countless forms of activity that constitute social behavior, bolstered stability and discouraged tendencies toward change.问题1选项A.spelled outB.manifestedC.givenD.explained【答案】B【解析】考查动词词义辨析。A选项spell out“讲清楚”；B选项manifest“呈现，显示”；C选项given“被给予”；D选项explain“解释”。根据空格后文的内容，传统通过这些形式进行呈现，可推测B选项符合题干内容。句意：在地方层面上，传统通过习俗、仪式、教育和无数形式的构成社会行为的活动，巩固了稳定，阻碍了变革的趋势。因此B选项正确。11. 单选题Because Chinese social tradition emphasized the（ ）of the individual to his birthplace and family, those gentry who served in public office were discouraged from concerning themselves with their native localities.问题1选项A.glueB.feelingsC.separationD.attachment【答案】D【解析】考查固定搭配。A选项glue“胶”；B选项feeling“感觉”；C选项separation“分离”；D选项attachment“连接，联系”，attach to“连接到”，为固定搭配。句意：因为中国的社会传统强调个人与他的出生地和家庭的连接，所以那些公职人员对于将他们与他们的祖籍在一起感到很懊丧。因此D选项正确。12. 不定项选择题We do not know when man first began to use salt, but we do know that it has been used in many different ways throughout history. (21)（ ）evidence shows, for example, that people who lived over three thousand years ago ate (22)（ ）fish. Stealing salt was considered a major crime at certain times in history. In the eighteenth century, for instance, if a person was (23)（ ）“stealing salt”, he could be put in prison. History reveals that about ten thousand people were put in prison during that century (24)（ ）stealing salt.In the modern world salt has many uses (25)（ ）the dining table. It is used in making glass and airplane parts, in the (26)（ ）of crops and in killing weeds. It is also used to make water soft, to melt ice on roads and highways, to make soap, and to (27)（ ）colors in cloth. Salt can be obtained in various ways, besides being taken from mines underground. Evaporation of salt water from the ocean or from salt water lakes or small seas is one of the (28)（ ）common processes for manufacturing salt. In Australia, it can even be taken from a “salt bush.” Yet, (29)（ ）it is obtained, salt will continue to play an important (30)（ ）in the lives of men and women everywhere.问题1选项A.AncientB.HistoricC.HistoricalD.Old问题2选项A.saltB.saltedC.saltingD.salty问题3选项A.arrestedB.caughtC.gotD.seized问题4选项A.asB.byC.forD.through问题5选项A.besidesB.beyondC.exceptD.over问题6选项A.bearingB.developingC.growingD.training问题7选项A.fastenB.fixC.preserveD.tie问题8选项A.littleB.manyC.muchD.more问题9选项A.howeverB.whateverC.wheneverD.wherever问题10选项A.dutyB.functionC.responsibilityD.role【答案】第1题:C第2题:B第3题:B第4题:C第5题:A第6题:C第7题:C第8题:B第9题:D第10题:D【解析】21.【试题答案】C【试题解析】考查上下文和词语辨析。A项ancient“古代的”，B项historic“有历史意义的”，C项historical“历史的”，D项old“老的”。上文提到it has been used in many different ways throughout history（盐的使用方式在历史上有很多种），那么接下来的空格根据文章逻辑可知是表示“历史证明”，historical evidence表示“历史证明，史实”。故该题选C。22.【试题答案】B【试题解析】考查词语辨析。A项salt“含盐的”，B项salted“用盐腌渍的，用盐调味的”，C项salting是salt的现在分词形式，D项salty“咸的；含盐的”。根据句子people who lived over three thousand years ago atefish（生活在三千多年前的人们吃鱼），结合上文提到了盐，可知空格是表示“咸鱼，腌鱼”；salted fish表示“咸鱼，腌鱼”。故该题选B。23.【试题答案】B【试题解析】考查动词辨析和语境。A项arrest“逮捕”，指根据法律或命令进行逮捕并予以监禁或拘留；B项catch“抓住”，指捉住跑动或隐藏中的人或动物，一般指活捉；C项get“得到”；D项seize“夺取，逮捕”，侧重指以突然、有力地动作迅速抓住或捉住。根据句子if a person was. “stealing salt”（如果一个人被偷盐），可知空格是表示“抓住”；故该题选B。24.【试题答案】C【试题解析】考查介词辨析。A项as“作为”，B项by“通过”，C项for“为，因为”；D项through“通过”。根据句子History reveals that about ten thousand people were put in prison during that centurystealing salt.（历史表明，在那个世纪大约有一万人被关进监狱偷盐。），可知空格是表示原因；故该题选C。25.【试题答案】A【试题解析】考查介词辨析。A项besides“除了还有，另外”，B项beyond“超过”，C项except“除外”；D项over“完全覆盖，翻转”。根据句子In the modern world salt has many usesthe dining table.（在现代，餐桌上，盐还有许多用途），结合后文可知空格是表示“除了”；故该题选A。26.【试题答案】C【试题解析】考查词义辨析。A项bearing“承载，忍受”，B项developing“发展”，C项growing“成长”；D项training“训练”。根据空格处后面的crops（庄稼，农作物）可知，空格表达的是“庄稼的种植”；故该题选C。27.【试题答案】C【试题解析】考查动词辨析。A项fasten“使固定”，B项fix“维修”，C项preserve“保存，维持”；D项tie“系牢，打结”。根据句子It is also used to make water soft, to melt ice on roads and highways, to make soap, and tocolors in cloth（它也被软化水，融化道路和高速公路上的冰，制造肥皂，以及给布料的颜色）可知，空格表达的是“保持颜色”；故该题选C。28.【试题答案】B【试题解析】考查词语辨析。A项little“少的”，修饰不可数名词，B项many“许多的”，修饰可数名词，C项much“许多”，修饰不可数名词；D项more“更多”，多用于比较级。根据空格处前面one of the可知，如果空格处是最高级，应该是one of the most，more是比较级，没有one of the more这个用法，因此D项排除。little和much都是修饰不可数名词，但是空格处后面是processes，所以A项和C项也排除。句意：从海洋、咸水湖或小海中蒸发盐水是制造盐的许多常见过程之一。故该题选B。29.【试题答案】D【试题解析】考查连词辨析。A项however“然而”，B项whatever“无论什么”，C项whenever“无论何时”，D项wherever“无论哪里”。根据句子Evaporation of salt water from the ocean or from salt water lakes or small seas is one of the much common processes for manufacturing salt. In Australia, it can even be taken from a “salt bush”.（从海洋、咸水湖或小海中蒸发盐水是制造盐的许多常见过程之一。在澳大利亚，它甚至可以取自“盐性灌木”。），结合前面提到的能够提取盐的地方，可知空格处应该是表示“无论在哪里获得盐”；故该题选D。30.【试题答案】D【试题解析】考查固定搭配。A项duty“责任”，B项function“功能”，C项responsibility“责任，义务”，D项role“角色”，固定搭配play a role in表示“在起作用”；句意：然而，无论在哪里获得盐，盐将继续在人们的生活中发挥重要作用。故该题选D。13. 不定项选择题Corporate and financial restructuring was not the reason for Japans commercial（31）. But it will be essential to the countrys future. Japans（32）production capacity will disappear. That fact, combined with the（33）labor force, will gradually depress the long-term growth rate to just 1 percent for two decades. Such a tepid growth rate could invite a financial crisis. The national debt has reached a vertiginous 160 percent of GDP.（34）this problem is the impending retirement of a large proportion of the work force. To thwart these trends, Japan must（35）taxes significantly, something that will only be possible if aggressive structural reforms have been put in place to raise production capacity and facilitate faster growth.Japan, however, is having second thoughts about the benefits of reform. The first warning（36）was a series of bureaucratic attempts to prevent foreigners from earning “inordinate” profits from the（37）in the economy. Tokyo decided last year to impose a tax on foreign investors in Japanese real（38）. The government has also proposed a levy on foreign private-equity that would allow domestic companies to use “poison pills” and other measures to prevent（39）mergers and acquisitions. The cumulative effect of these initiatives would be to（40）the catalytic process of foreign direct investment.问题1选项A.boomB.prosperityC.flowerD.resurgence问题2选项A.extraB.surplusC.additionalD.more问题3选项A.growingB.expandingC.shrinkingD.contracting问题4选项A.ExacerbatingB.ImprovingC.Turning for the betterD.Deteriorate问题5选项A.hikeB.decreaseC.go upD.go down问题6选项A.signB.signalC.arrivalD.coming问题7选项A.addictionB.tangleC.involvementD.entanglement问题8选项A.propertyB.housingC.possessionsD.estate问题9选项A.friendlyB.kindC.hostileD.cruel问题10选项A.encourageB.discourageC.pushD.drag【答案】第1题:A第2题:B第3题:C第4题:A第5题:A第6题:B第7题:C第8题:D第9题:C第10题:B【解析】31.【试题答案】A【试题解析】考查名词词义辨析。A选项boom“繁荣”；B选项prosperity“繁荣，成功”；C选项flower“花，精华”；D选项resurgence“复活，再现”，根据上下文，可推测，这里应该讲的日本商业繁荣，可排除C、D选项，commercial boom“商业繁荣”为固定搭配，可排除B选项。句意：公司和金融重组不是日本商业的原因。因此A选项正确。32.【试题答案】B【试题解析】考查形容词词词义辨析。A选项extra“额外的”；B选项surplus“剩余的，过剩的”；C选项additional“附加的”；D选项more“更多的”。四个选项中的词都有“过多，额外”的意思，又根据“production capacity生产能力”，可知此处表示的应该是“生产力过剩”，即“surplus production capacity”。句意：日本的生产能力将会消失。因此B选项正确。33.【试题答案】C【试题解析】考查动词词义辨析。A选项growing“生长；发育”；B选项expanding“扩大；扩展”；C选项shrinking“缩水，收缩”；D选项contracting“收缩，缩小”，前面提到生产力过剩将会消失，后面又提到增长率的下降，所以我们可知该空表达的是“劳动力区域短缺”，即“shrinking labor force”，因为生产力不足结合劳动力不足，就会导致增产率的下降，甚至招来金融危机。因此C选项正确。34.【试题答案】A【试题解析】考查动词词义辨析。A选项Exacerbating“恶化”；B选项Improving“提高；改善”；C选项Turning for the better“好转”；D选项Deteriorate“恶化”。该空前一句的意思是“国民债务已经达到了GDP的160%”。所以此处的意思是“大量的劳动力的即将退休将会加剧这个问题”，四个选项中表示“加剧，恶化”的是A。D虽然也有此意，但形式不对，应该用动词ing的形式。因此A选项正确。35.【试题答案】A【试题解析】考查动词词义辨析。A选项hike“远足”；B选项decrease“减少，减小”；C选项go up“增长；上升”；D选项go down“下降”。如果要解决前面的问题，就必须增收赋税。四个选项中hike, go up 表示“提高”，但是“go up”是不及物动词，只能表示“tax goes up”，所以答案为A。因此A选项正确。36.【试题答案】B【试题解析】考查动词词义辨析。A选项sign“迹象”；B选项signal“信号；暗号”；C选项arrival“到来；到达”；D选项coming“到来”。warning signal表示警告信号，符合文章内容。warning sign通常表示警告牌，警告标志，可排除。因此B选项正确。37.【试题答案】C【试题解析】考查名词词义辨析。A选项addiction“上瘾，沉溺”；B选项tangle“缠结，混乱”；C选项involvement“参与，牵连”；D选项entanglement“纠缠”。后面三个选项意思相近，这里有固定搭配，involvement in the economy“经济干预，经济参与”。句意：第一个警告信号是一系列的官僚主义企图阻止外国人从经济赚取“过多”的利润。因此C选项正确。38.【试题答案】D【试题解析】考查名词词义辨析。A选项property“性质，性能”；B选项housing“房屋”；C选项possessions“财产，所有物”；D选项estate“房地产，财产”。固定词组，real estate房地产。句意：日本政府去年决定对外国投资者征收日本税。因此D选项正确。39.【试题答案】C【试题解析】考查形容词词义辨析。A选项friendly“友好的，亲切的”；B选项kind“和蔼的，宽容的”；C选hostile“敌对的，敌方的”；D选项cruel“残酷的，残忍的”。固定搭配，hostile merger and acquisition恶意并购，恶意收购。该句子的意思是“阻止恶意兼并”。句意：政府还提议对外国私募股权投资征税，这将允许国内公司使用“毒丸”和其他措施来阻止宗合并和收购。因此C选项正确。40.【试题答案】B【试题解析】考查动词词义辨析。A选项encourage“鼓励，怂恿”；B选项discourage“阻止，使气馁”；C选项push“推动，增加”；D选项drag“拖拉，拖曳”。前面提到了日本对外商采取的措施：阻止外商通过参与日本经济从中获利；增加外商在日本房地产业的税收；阻止恶意并购。这些措施都会阻止外商在日本的直接投资，所以表示“阻止”的B选项。句意：这些倡议的累积效果将是外国直接投资的催化过程。因此B选项正确。14. 不定项选择题The history of AfricanAmericans during the past 400 years is traditionally narrated（61）an ongoing struggle against（62）and indifference on the part of the American mainstream, and a struggle（63）as an upward movement is（64）toward ever more justice and opportunity.Technology in and of（65）is not at fault; its much too simple to say that gunpowder or agricultural machinery or fiber optics（66）been the enemy of an（67）group of people. A certain machine is put（68）work in a certain way the purpose（69）which it was designed. The people who design the machines are not intent on unleashing chaos; they are usually trying to（70）a task more quickly, cleanly, or cheaply,（71）the imperative of innovation and efficiency that has ruled Western civilization（72）the Renaissance.Mastery of technology is second only（73）money as the true measure of accomplishment in this country, and it is very likely that by（74）this under-representation in the technological realm, and by not questioning and examining the folkways that have（75）it, blacks are allowing（76）to be kept out of the mainstream once again. This time, however, they will be（77）from the greatest cash engine of the twenty-first century. Inner-city blacks in particular are in danger, and the beautiful suburbs（78）ring the decay of Hartford, shed the past and learn to exist without contemplating or encountering the tragedy of the inner city.And blacks must change as well. The ways that（79）their ancestors through captivity and coming to freedom have begun to lose their utility. If blacks（80）to survive as full participants in this society, they have to understand what works now.问题1选项A.likeB.asC.forD.with问题2选项A.charityB.clarityC.cohesionD.oppression问题3选项A.chartingB.chartsC.chartedD.to chart问题4选项A.progressingB.progressedC.clutchedD.clutching问题5选项A.itselfB.themselvesC.ourselv