在氢氧化钠溶液中加入盐酸，至恰好完全反应。下列有关认识错误的

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问题选择题

在氢氧化钠溶液中加入盐酸，至恰好完全反应。下列有关认识错误的是 [ ]

A．反应结束时溶液的pH=7

B．反应前后元素的种类没有变化

C．酸与碱的反应属于复分解反应

D．说明所有物质都是由分子构成的

答案

答案：D

填空题

单词拼写：根据句意和提示写出所缺单词。

1. The musicians were to play __________ (玩笑) on each other as well as play music.

2. Who will be in __________ of (管理) our class while Mr. Liu is away?

3. After graduating from college, we __________ (最终) got the chance to go abroad.

4. After ten days of hard work, he _________ (成功) in working out the problem at last.

5. I knew it would help us achieve our dream of making black and white people __________ (平等).

6. The house was __________ (埋) under ten feet of snow.

7. Although many Americans move a lot, they still __________ (辨别出) and understand each other's dialects.

8. Yesterday my parents bought me an __________ (电子) dictionary.

9. In relief, Daisy burst into __________ (笑声).

10. We are __________ (关心) about the child's safety.

单项选择题

食品加工人员每年应进行健康检查，取得（）；上岗前应接受卫生培训。

A.健康证明

B.从业资格

C.安全培训

D.单位任命