在钻进中遇到溶洞，钻具突发放空，此时应警惕（）、（）、（）等复杂情况的发生。

阅读理解。

      What do pen pals write in the letters? In the children's letters, they often write about their school days, hobbies, and favorite stars. They may be from different(不同的)countries, and they may have lots of things to tell their pen pals. Some of them also send letters with their photos, and then their friends can "see" their life.

     Many Chinese children are amazed to see their American friends are so free(自由) and relaxed at

school. They don't have much homework. They are also amazed to see American students go to school

in all kinds of funny clothes.

     The American students are amazed to see their Chinese friends are good at all subjects. They think

Chinese words are too difficult, but their Chinese friends can write them well.

     Pen pals can know many new things from the letters. So they often write to each other(互相).

1. Pen pals often write about _____ in their letters.  

A. school days

B. hobbies

C. favorite stars

D. all above (以上全部)

2. Some of the pen pals also send _____ in their letters, and then their friends can "see" their life.

A. stamps(邮票)

B. food

C. photos

D. clothes  

3. According to the passage, American students wear _____ to go to school. 

A. school uniforms

B. only T-shirts

C. only jeans

D. all kinds of funny clothes  

4. The American students think Chinese words are too _____.

A. easy(简单的)

B. hard

C. interesting

D. beautiful

5. The underlined word "amazed" means "_____" in Chinese. 

A. 惊讶的

B. 愉快的

C. 困难的

D. 愚昧的

在买卖合同中，除法律另有规定或者当事人另有约定外，标的物意外灭失的风险，自（）之后，由买方承担。

A.合同成立

B.所有权转移

C.标的物交付

D.合同生效

下列不属于写字楼物业管理风险种类的是（）。

A.工程隐患风险

B.设备运行风险

C.设备运输风险

D.消防防范风险

锅炉水压试验通常每（）年进行1次。

A、1

B、3

C、6

患者，女，20岁。经期先后不定，经色正常，经前 * * 胀痛，经期小腹痛，性情急躁，舌苔薄黄，脉弦。用药宜首选（）

A.疏肝理气药

B.活血止痛药

C.温阳滋阴药

D.补血滋阴药

E.温脾和胃药