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【单选题】
已知两个平面互相垂直,下列命题中,正确命题的个数是( ) 1一个平面内的直线必垂直于另一个平面内的无数条直线 2一个平面内的且垂直于这两个平面交线的直线必垂直于另一个平面内的任意一条直线 3一个平面内的任何一条直线必垂直于另一个平面 4过一个平面内的任意点作交线的垂线,则此直线必垂直于另一个平面A.
4
B.
3
C.
2
D.
1
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举一反三
【单选题】24 March Dear Julie, I'm sorry I haven't written for a while, but I've been busy at work and have spent almost all my spare time looking for a flat(公寓). I saw a really nice place this morning--a third...
A.
He goes out with friends.
B.
He takes Japanese lessons.
C.
He looks for a place to live in.
【单选题】将固体 NH 4 NO 3 溶于水,溶液变冷,则该过程的 G , H , S 的符号依次是 ( )
A.
+ - -
B.
+ + -
C.
- + -
D.
- + +
【单选题】I haven't finished my composition. I _____ for two hours and a half. [ ]
A.
have written it
B.
have been writing it
C.
wrote it
D.
am writing it
【单选题】听力原文：W: I haven't written to my parents for almost three months. They must be very angry with me. M: I don't think it is that serious. What will the woman probably do?
A.
She will go home.
B.
She will telephone home.
C.
She will write home.
D.
She won't do anything.
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