题目内容：

1.——Shall we go on a picnic this weekend?
——Good idea,unless it _______
A.rains B.will rain C.doesn't rain D.won't rain
2.——There was too much destroying weather this year.
——Yes,that's a serious problem.People_______protect the earth well.
A.have to B.must C.will D.can
3.He isn't the man _______I spoke to in the classroom.
A./ B.which C.whose D.where
4.All the information you need is on the Internet.Get online,and you will get _______.
A.them B.one C.it D.those
5.The places _______ the animals lived many years ago have changed a lot.
A.where B.which C.that D./
6.You'd better start out early _______ you can make it.
A.even though B.as if C.what if D.so that
7.The river is more than _______ .
A.twenty meter wide B.twenty meters wide
C.twenty meter of wide D.wide of twenty meter
8.It is difficult for us to learn a lesson in life _______we've actuallyhad that lesson.
A.when B.after C.since D.until
第五个问题是定语从句吗?如果是，请帮我讲一下相关的知识！

优质解答

1.A.rains unless符合“主将从现”2.B.must have to有一种被迫的意思,不得不,而此处则表达的是必须的意思3.A./ 所选内容应在从句中作宾语,因此排除C、D；which不能带指人,所以选A4.C.it 此处所选内容带指information...