某区域农田土壤调查中，测得土壤中铜的含量为75mg／kg。已知土壤环境质量标准值一级

用“√”选出下列加粗字的正确读音。

玉澜堂（lán jiǎn）    澎湃（péng pēng）     锨镐（gāo gǎo）

吮吸（shǔn yǔn）      翘起（qào qiào）       矗立（chù zhù）

根据句意和首字母完成单词。

1. I think you'd better take your father's a_____.

2. We often take four c_____ in the morning from Monday to Friday.

3. Last Sunday he gave me a pen as a g_____ for my birthday.

4. We often go to the a _____. There are sharks and seals in it.

5. Tina bought a s_____ in the zoo.

6. Toby won a gold prize in the c_____.

7. You should play some o_____ sports in the morning because the air at the moment is clean.

8. —Did you get Wan Fei's a_____.

    —Yes, I did. She wrote her name on the cover of my new notebook.

9. It is raining. You had better take an u_____ with you.

10. I want to be a teacher in the f_____.

我们常会看到这种现象：学校举行男生足球比赛，女同学常常在球场上为本班男同学助威；植树活动中，男同学也会主动帮助女同学挖坑、浇水；课堂上，男女同学相互帮助，开展合作学习……由此可见，男女同学间的正常交往[ ]

①可以增进对异性的了解，学习对方的长处②有利于营造良好的班集体氛围③可以扩大交往范围，锻炼交往能力④可以学习如何适应社会对不同性别的要求，增进自己的性别意识

A．①②③

B．①③④

C．①②③④

D．②③④

电击导致心室纤维性颤动造成死亡。流过人体的电流很小时，没有什么感觉，随着电流和电击时间的增加，对人身的危害就越严重。中国电气安全电流为（）。

A.10mA

B.20mA

C.30mA

D.50mA

热脱扣器的作用是（）。

A.失压保护

B.短路保护

C.过载保护

D.高压保护