简述痰液检验－显微镜检查

阅读下列短文，根据短文内容选择最佳答案。

     There is a man. He has a son. He loves him very much. Every day after work the man comes home

and plays with the little boy.

     When the man comes home from work one night, he has other things to do. And he can't play with his

little son. He wants to give the boy something to keep him busy. Then, he has an idea. He sees a magazine

with a large map of the world on the cover (封面). He tears (撕) the map up into pieces (片). He puts the

pieces on the table in the dining room. He tells the boy it is a map of the world. He asks the boy to put

them back together and they can play together when he finishes. He thinks it can keep the boy busy for

hours.

      After about thirty minutes, the boy comes to the man and says, " I finish the map. Dad, can we play

now?" The man is surprised (惊讶的), saying, "How do you do that?" The boy says, "It's easy. On the

back (背面) of the page is a picture of a man. When I put the man together, the world appears completely

(完整地呈现)."

1. Why can't the man play with his son one night?

A. He wants to read a magazine.

B. He has other things to do.

C. He must learn something about a map.

D. He must stay at his office.

2. What does the man ask his son to do?

A. To read the magazine to find a map.

B. To tear the map of the world up into pieces.

C. To put the pieces of the map of the world together.

D. To read the map of the world.

3. How long does the boy do it?

A. Two hours

B. About an hour

C. About half an hour

D. The night

4. What do you think of the boy?

A. Clever

B. Polite

C. Helpful

D. Lazy

5. Which of the following is TRUE (正确的)?

A. It's about a father's work.

B. It's a story between a father and his son.

C. It's an advertisement(广告) for the map of the world.

D. It's a poster about how to read a map.

儿童患者，消化道扭转的好发部位在（）

A.胃

B.小肠

C.横结肠

D.结肠肝曲

E.乙状结肠

在研究生物进化的过程中，______是非常的重要证据．始祖鸟化石的发现，说明鸟类是由古代的______动物进化而来的．

简述从草木灰中提取碳酸钾的操作步骤？

多组分在线监测装置技术指标乙烷最高检测限值（）μL/L。

A.2000

B.1000

C.5000

D.15000