根据我国有关法律的规定，无效合同的确认权属于（）。 A.人民法院 B.保险人 C.投

词汇运用。根据首字母或汉语提示，写出所缺的单词。

1. Thanks for _________ (选择) such a nice birthday present for me.

2. Listen! You really need to __________ (锻炼) more and eat less.

3. Halloween is a special __________ (节日) in Western countries.

4. I seldom sit between __________ (they).

5. It's my _________ (one) time to have a good time on the Great Wall.

6. How many _________ (猴子) are there on the farm?

7. Our English teacher often ________ (dress) up in a nice suit when a new term starts.

8. Millie is one of the best ________ (swim) in our school.

9. My cat is climbing ________ (穿过) the window to catch the mouse.

10. Eat more vegetables and fruit, and you can stay ________ (health).

—How far is your family from here?

—It's about ten _______ walk.[ ]

A. minute's

B. minute

C. minutes'

D. minutes

为改善火药的安定性，一般在火药中加入少量的化学安定剂( )。

A．硝酸铵

B．三甲苯

C．一氧化二氨

D．二苯胺

保安员提供服务的主要内容是（）。

A.安全防范服务

B.治安防范服务

C.案件调查服务

D.各种社会管理服务

乳化泵达不到所需工作压力的可能原因是（）。

A、电气系统故障

B、乳化箱中乳化液不足

C、泵吸入空气

D、接头或管路漏液

E、安全阀调定值低