问题 单项选择题 B型题

是巨噬细胞的主要能源物质()。

A.谷氨酰胺

B.膳食纤维

C.生长激素

D.支链氨基酸

E.精氨酸

答案

参考答案:E

解析:谷氨酰胺是小肠黏膜和胰腺细胞的主要能源物质,缺乏会导致肠黏膜细胞萎缩。膳食纤维可调整结肠动力、刺激结肠黏膜细胞的增生,是结肠细胞的营养底物。生长激素具有明显的促合成代谢作用,可以促进体内蛋白质的合成。支链氨基酸属必需氨基酸范围,可以与芳香氨基酸竞争通过血脑屏障,在肝性脑病时有利于对脑内氨基酸谱失衡的纠正。精氨酸是淋巴细胞、巨噬细胞及参与伤口愈合的细胞的能源物质。

阅读理解

阅读理解

     We can see many walls in the world. But the Great Wall of China is the biggest of all. The Chinese

call it "The Ten-thousand-li Great Wall". It is in fact more than 6,000 kilometers long. It is 4-5 meters

wide. In most places, five horses or ten men can walk side by side.When you visit the Great Wall, you

can't help wondering how the Chinese people were able to build such a great wall thousands of years

ago. Without any modern machines, it was really very difficult to build it. They had to do all the work

by hand. It took millions of men hundreds of years to build it.

     The Great Wall has a history of over two thousand years. The kings began to build the first parts

of it around two thousand seven hundred years ago. Then Qin Shihuang had all the walls joined up. He

thought that could keep the enemy out of the country.

     Today the Great Wall has become a place of interest. Not only Chinese people but also people from

all over the world come to visit it.

1. The Great Wall is the biggest of all walls in __________.

A. China

B. Europe

C. the world

D. Asia

2. How long is the Great Wall?

A. It's less than six hundred kilometers.

B. It's over six million kilometers.

C. It's six thousand kilometers.

D. It's more than six thousand kilometers.

3. It took __________ men __________ years to build the Great Wall.

A. millions; millions

B. hundreds of; hundreds of

C. millions of; hundreds of

D. hundreds of; millions of

4. The Great Wall was built __________.

A. by people all over the world

B. without any modern machines

C. with some other countries' help

D. by all Chinese kings

5. Qin Shihuang thought the Great Wall could __________.

A. keep the enemy out of his country

B. keep his body in it

C. be visited by all the people

D. make his country beautiful

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