氯酸钾（KClO3）中氯元素的化合价为 A．﹣1 B．﹢3 C．﹢5 D．﹢7

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问题选择题

氯酸钾（KClO₃）中氯元素的化合价为

A．﹣1

B．﹢3

C．﹢5

D．﹢7

答案

答案：C

题目分析：化合价的一般规律告诉我们：在化合物中，正负化合价的代数和为0，钾元素的化合价为+1，氧元素的化合价为-2，所以+1+x+(-2)×3=0,x=+5，故选C

写作题

听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标

在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对

话仅读一遍。

1. What was 'the woman's first job?

A. A teacher.

B. A secretary.

C. A doctor.

2. When did the show begin?

A. 9:50.

B. 9:40.

C. 9:30

3. What are the two speakers doing?

A. Enjoying meeting each other.

B. Saying good-bye to each other.

C. Planning to see each other again.

4. Where does the dialogue take place?

A. In an office.

B. In a clothing shop.

C. In the man s house.

5. What will the woman do tonight?

A. She will stay at home with the man.

B. She will send for a doctor by herself.

C. She will watch the weather forecast.

问答题简答题

地震的现场救护原则是什么？