高二英语课下作业北师大版选修7《Unit 21 Human Biology》Section Ⅰ 语言点二应用落实

111.选词填空1My bike bought 10 years ago is still in_use.2The parents are determined to support their daughters college education at_all_costs.3They chose some people at_random in the street to give the questionnaires.4Tidying up the room, she came_across some old photographs in a drawer. 5The teams success was largely due_to Marys efforts.6I spent three days putting up a cottage but a storm made it in_vain.单项填空1His efforts to raise money for his program were _ because no one showed any intention to take a cent out of their pockets.Ain placeBin sightCin effect Din vain解析：选D。考查in vain的用法。in place“在适当的位置，准备就绪”；in sight“在视线内”；in effect“生效，起作用”；in vain“徒劳”。根据句意“他为他的项目筹集资金的努力付诸东流了，因为没有一个人愿意从腰包里掏出一分钱。”可知应选D。2Chinese government prevented Swine Flu from spreading _.Aat a cost Bat the costCat all costs Dat cost解析：选C。句意：中国政府将不惜一切代价阻止猪流感蔓延。at all costs“不惜一切代价，无论如何”。3When he got home, he just placed his film ticket _. Now he doesnt know where to find it.Aat random Bin vainCon occasion Dby chance解析：选A。考查词组辨析。at random“随便地，随意”；in vain“徒劳，白费力气”；on occasion“偶尔，偶然”；by chance“偶然”。根据句意“当他到家时，他只是随便把电影票放了起来。现在，他找不到票了。”可知应选A。111