问题 选择题

下列关于乙烯的叙述错误的是

A.乙烯分子中6个原子处于同一平面

B.乙烯是一种不饱和烃,结构简式为C2H4

C.乙烯是一种基本化工原料

D.乙烯可使酸性高锰酸钾或溴的四氯化碳溶液褪色

答案

答案:B

题目分析:乙烯是平面型,6个原子在一个面上,A项正确;结构简式是CH2=CH2;B项错误;乙烯用途广泛,C正确;乙烯的碳碳双键可发生加成或氧化反应,D项正确。

点评:属于较简单题。

阅读理解

阅读理解。

     The kids at the top of the class get there by mastering (掌握) a few good ways that others can learn.

Here are some secrets of straight-A (全优的) students.

     ① Study comes first. When the books are open, phone calls will not be answered, TV shows will not

be watched.

     ② Study anywhere or everywhere. Some students work late at night when the house is quiet. Others

wake up early. But straight-A students study as soon as they come home from school. All agree that they

succeed in their study because they can keep studying like this.

     ③ Organize well. Don't waste time looking for a pencil or missing paper. Keep everything at the right

place.

     ④ Plan your time. If you want to be a straight-A student, make sure to finish all your tasks before the

deadine (最后期限).

     ⑤ Take good notes and use them. The teacher will test you on what he or she emphasized (强调).

That's what you find in your notes.

     ⑥ Do more than you are asked. Part of learning is practicing. The more you practice, the better you

will learn.

1. From the passage, if a task should be completed next Wednesday, a straight-A student win complete

    it _____.

A. next Tuesday

B. next Thursday

C next Friday

D. next Saturday

2. Li Bing watches TV as soon as he gets home and often looks around for his ball pen when he does his homework. What kinds of learning ways above do you think he has to master?

A..①⑤

B. ②⑥

C. ①③

D. ④⑤

3. From the passage, you know a straight-A student has mastered the following learning ways except _____.

A. organizing well

B. planning his time

C. taking good notes and using them

D. testing himself

单项选择题