吸附-解吸气相色谱法测定空气中氯乙烯时，应对采样管的两段吸附剂分段作色谱分析。

（3）根据拟定的教学目标和教学重点，设计课堂教学环节并简要说明理由。

数列{a_n}是等差数列，a₁=1，a_n=-512，S_n=-1022，求公差d．

阅读理解(共5小题；每小题2分．满分10分)

根据短文内容，在相应题号后的横线上写下相关信息(不多于七个单词)，完成对该问题的回答。答语要求结构正确，书写工整，字迹清楚。

The Fun They Had in School

On the page headed May l7，2517，Margie wrote in her diary，“Today Tommy found a real book!”

It was a very old book covered with dust．Margie’s grandfather once said that long ago all stories were printed on paper

“What is it about?” asked Margie

“School”

“School? What’s there to write about school? I hate school．”

Margie hated school now more than ever．The electric teacher had bee giving her drill after drill in geography and she had been doing worse and worse until her mother had finally sent for someone to fix the teacher

The man came with a whole box of tools．He turned off the elecuicity，and started to repair the teacher．There was a momtor that showed questions，and a hole where Margie had to put compositions and test papers．The electric teacher marked the paper quickly．

Margie asked Tommy，“Why would anyone write about school?”

“Because it’s the school they bad hundreds of years ago”

Margie read the book for a while，then said，“Anyway，they had a teacher？”

“Yes，but it was a man”

“A man? How could a man be a teacher?”

“Well，he just told the kids things and gave them homework”

“A man isn’t smart enough．”

“Sure he is．My father knows as much as my teacher’’

“But I wouldn’t want a strange in my house to teach me．”Margie argued

Tommy laughed．“The teacher didn’t live in the house．They had a special building and all the kids went there”

“And all the kids learnt the same thing?”

“Sure，if they were the same age”

They weren’t even half-finished when Margle’s mother called．“Margfa! School!”

Margie went into the school next to her bedroom，and the electric teacher was waiting far her them．It was the same way every day except Saturday and Sunday

The monitor lit up，and it said，“Please put yesterday’s homework in the proper hole”

Margie sighed and threw a dirty sock at the machine．She was thinking about the old days．All the kids from the whole neighborhood came to the school，Iaughing and shouting in the yard．They could even help one another with the homework

And the teachers were people!

How happy they were in the old days，Margie thought．

1．When did the story in the passage take place?

2．Wny did Margie hate school?

3．How did Margie feel when she heard that teachers of hundreds of years ago were people instead

of machines?

4．How did kids in Margie’s time receive education?

5．What does the underlined word“They”refer to in the title?

凭执业医师和执业助理医师处方方可购买的药品是（）

A.处方药

B.非处方药

C.中成药

D.中药饮片

E.西药

隔墙轻钢龙骨的安装工艺流程是（）。

A.弹线、分档→做地枕带→固定边框龙骨→固定沿顶、沿地龙骨→安装竖向龙骨→安装门、窗框→安装加强龙骨→安装支撑龙骨→检查龙骨安装质量

B.弹线、分档→做地枕带→固定沿顶、沿地龙骨→固定边框龙骨→安装竖向龙骨→安装门、窗框→安装加强龙骨→安装支撑龙骨→检查龙骨安装质量

C.弹线、分档→做地枕带→安装竖向龙骨→固定边框龙骨→固定沿顶、沿地龙骨→安装门、窗框→安装加强龙骨→安装支撑龙骨→检查龙骨安装质量

D.弹线、分档→做地枕带→固定沿顶、沿地龙骨→固定边框龙骨→安装门、窗框→安装加强龙骨→安装支撑龙骨→安装竖向龙骨→检查龙骨安装质量