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问题 选择题

乙醇分子结构中各化学键如下图所示。关于乙醇在各种反应中断键说法不正确的是

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A．和金属钠反应时①断裂

B．乙醇燃烧是断裂②和⑤

C．在银催化条件下与O2反应时断裂①和③

D．和浓H2SO4、乙酸共热时断裂①，其他键不变化

答案

答案：B

选择题

设集合M={x|x＜2012}，N={x|0＜x＜1}，则下列关系中正确的是（　　）

A．M∪N=R

B．M∩N={x|0＜x＜1}

C．N∈M

D．M∩N=φ
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听力题

小题1:Which is the _______ (路) to the bank?

小题2:He usually goes ___________ (游泳) in his free time.

小题3:It is not _________ (容易的) for us to learn English well.

小题4:Can you tell me something about your school __________ (生活)in America?

小题5:The old man ___________ (想念) his son very much.

小题6:_________ _______ (等候) your turn when the light is red.

小题7:The bookstore is __________ __________ (在对面) the bank.

小题8:Look! Tom is __________ _______ (寻找) his lost purse.

小题9:We should __________ __________ (保持安静) in the reading room.

小题10:You must return the book ______ _______ (准时).
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