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【单选题】
下列关于甲烷的叙述正确的是（ ）A.
甲烷分子的空间构型是正四面体，所以，CH 2 Cl 2 有两种不同构型
B.
甲烷可以与氯气发生取代反应，因此，可以使氯水褪色
C.
甲烷能够燃烧，在一定条件下会发生爆炸，因此，是矿井安全的重要威胁之一
D.
甲烷能使KMnO 4 溶液褪色
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【简答题】We often ________ (play) on the playground．
【单选题】— Did you hand in your application for a league member? — Not yet. If I _____ to see my father, I would have. [ ]
A.
didn't go
B.
haven't gone
C.
wouldn't have gone
D.
hadn't gone
【简答题】投入产出分析与马克思主义再生产理论有哪些联系?
【单选题】--- Could you tell us ______? ---- About two weeks.
A.
how often are we going to be away
B.
how often we are going to be away
C.
how long are we going to be away
D.
how long we are going to be away
【简答题】We are often told not to be __________(紧张) in the examinations.
【单选题】— We didn't see you at this morning's meeting. — ______, but if I hadn't had to meet a friend, I would have been there. [ ]
A.
I'm sorry
B.
Me, too
C.
Never mind
D.
Thank you
【简答题】同义句转换。 1. On weekends we often have an English party. On _______ and _______ we often have an English party. 2. Where are they from? Where do they _______ _______? 3. Let's go to a movie. Let's ______...
【单选题】We _____ at school from Monday to Friday. [ ]
A.
is often
B.
are often
C.
often is
D.
often are
【简答题】Help was often given to him by us. We often ______ him ______.
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