问题 单项选择题 A1/A2型题

胆固醇可衍生成()

A.ACTH

B.TSH

C.前列腺素

D.肾上腺皮质激素

E.肾上腺髓质激素

答案

参考答案:D

解析:肾上腺皮质分泌盐皮质激素、糖皮质激素、雄激素和少量雌激素。这些激素的前体均是胆固醇,是由17个碳原子组成的四环烷,称类固醇激素,C17位有酮基者称17酮类固醇(17-KS);C17位有羟基者称17-羟基类固醇(17-OHCS)。

完形填空

Today there are policemen everywhere, but in 1700, London had no policemen at all. A few old men used to protect the city streets at night and they were not paid.

About 300 years ago, London was starting to get bigger and more and more people began to live there. The city was very dirty and many people were poor. (93). There were so many thieves who stole money in the streets that people stayed in their homes as much as possible.

In 1750, Henry Fielding started to pay a group of people to stop thieves. They were like policemen and were called "Bow Street Runners" because they worked near Bow Street.

Fifty years later, there were 120 "Bow Street Runners", but London had become very big and needed more policemen. So in 1829, the first Metropolitan (or London) Police Force was started with 3,000 officers. Most of the men worked on foot, but a few rode horses. Until 1920 all the police in London were men.

(94). Today, London police are quite well paid, especially for the few police officers who still ride horses, the pay is even better than for the others.

A.根据短文内容简要回答下列问题:

小题1:Why did people stay in their homes as much as possible about 300 years ago?

________________________________________________________

小题2:When was the first London Police Force started with 3,000 officers?

________________________________________________________

B. 将短文中划线的两个句子译成汉语。

小题3:________________________________________________________

小题4:________________________________________________________

小题5:请给短文拟一个适当的英文标题_______________________________

改错题