500kV变压器和240MVA以上容量变压器，制造厂应提供同类产品（）。 A.突发短

阅读理解。

　　How much sleep do we need? We are all different. Some people need only

three hours of sleep a night. Others need ten hours of sleep a night. Most

Americans sleep an average of seven to eight hours a night. After age fifty, the

average sleep time goes down t0 6. 5 hours a night.

　　Most people have a bad night when they cannot fall asleep. The name of this

problem is called insomnia.

　　This is not a new problem. Many famous people in history had insomnia.

Some of these people had special ideas to make them sleep.  Benjamin Franklin,

the famous statesman (政治家) and inventor, had four beds.  He moved from one

to another to fall asleep. King Louis XI V of France had four hundred and thirteen

beds and hoped to fall asleep in one of them. Mark Twain, the famous American

writer, had a different way. He laid on his side across the end of his bed.

1. What does the sentence in the passage "We are all different." means?

A. We don't look the same.

B. No one looks like each other.

C. We go to bed at different time.

D. Our sleeping time is not the same.

2. In Chinese the word "insomnia" means _____.

3. As people grow old, they need _____at night.

A. more sleeping time

B. no sleeping time

C. less sleeping time

D. a fixed time to sleep

4. People with the problem of insomnia _____.

A. are too busy to sleep

B. find it difficult to fall asleep

C. find it hard to wake up in the morning

D. have more beds

5. The best title for this passage may be _____.

A. How to Solve the Sleeping Problem

B. People and Sleep

C. How Famous People Tried to Sleep

D. People and Insomnia

阿司匹林的抗血小板作用机制是（）

A.促进血小板中PGI的合成

B.促进血管内皮细胞中PGI的合成

C.抑制血小板中TXA的合成

D.抑制血管内皮细胞中TXA的合成

E.激活环氧酶

企业竞争战略

骨缝约在_______时闭合，后囟最迟在______时闭合，前囟约在______时闭合，前囟应测量_______________。

我国传染病防治法规定，法定报告病种分为（）

A.二类25种

B.三类37种

C.四类23种

D.五类22种

E.一类26种