Unit 1 book 4l.Once I stop。Unit 1 book 6At the time they were created。Unit 1 book 51. Neither its cause nor its cure was understood.解析。
单元句型归纳整理Tag内容描述：
1、Unit 1 book 8However, it is likely that Native Americans were living in California at least fifteen thousand years ago.解。
2、Unit 1 book 4l.Once I stop, it all comes crowding in and I remember the chimps in laboratories.解析：once引导条件状语从句，意为一旦。e.g.。
3、Unit 1 book 6At the time they were created, the Impressionist paintings were controversial, but today they are accepted 。
4、Unit 1 book 7I have a very busy life with no time to sit around feeling sorry for myself.解析：feeling sorry for myself是一个现。
5、Unit 1 book 2There is no doubt that the boxes were then put on a train for Knigsberg, which was at that time a German ci。
6、Unit 1 book 51. Neither its cause nor its cure was understood.解析：neither.nor.既不也不。1. So many thousands of terrified peop。