问题 单项选择题 B1型题

参与肌酸合成的是()。

A.牛磺酸

B.亮氨酸

C.酪氨酸

D.谷氨酰胺

E.精氨酸

答案

参考答案:E

解析:1.支链氨基酸包括L-亮氨酸、L-异亮氨酸、L-缬氨酸。它们都属于必需氨基酸。2.含硫氨基酸共有蛋氨酸、半胱氨酸和胱氨酸3种,另有一种含硫氨基酸是牛磺酸。3.人体合成精氨酸、组氨酸的能力不足以满足自身的需要,需要从食物中摄取一部分,人们称之为半必需氨基酸。4.谷氨酰胺是人体重要的氨基酸,是肠道的主要供能物质。5.人体由3种氨基酸--甘氨酸、精氨酸和蛋氨酸来合成肌酸。

阅读理解

For centuries, the body's blood has been linked closely with the emotions.People who show no human emotions or feelings, are said to be cold-blooded killer.For example, the police are searching for a cold-blooded killer.He seems to kill for no reason, and no emotion, as if taking someone's life as nothing.

Cold can affect other parts of the body.The expression "get cold feet" has nothing to do with cold or your feet.The expression means being afraid to do something you have decided to do.For example, you agree to be president of an organization.But then you learn that all the other officers have resigned, and all the work of the organizations will be your responsibility.You are likely to get cold feet about being president when you understand the situation.

The expression "give someone the cold shoulder" probably comes from the physical act of turning your back toward someone, instead of speaking to him face to face.You may give a cold shoulder to a friend who has not kept a promise he made to you.Or, to someone who has lied about you to others.

A cold fish is not a fish.It is a person.But it is a person who is unfriendly, unemotional and shows no love or warmth.A cold fish does not offer much of himself to anyone.Someone who is a cold fish could be cold-hearted.Now a cold-hearted person is someone who has no sympathy.Several popular songs in recent years were about cold-hearted men or cold-hearted women who, without feelings, broke the hearts of their lovers.

"Out in the cold" means not getting something that everybody else got.A person might say that everybody but him got a pay raise——he was left out in the cold.And it is not a pleasant place to be.

小题1:When you refuse to speak to a man and treat him in a distant way, you may express by "_____".

A.I give him the cold shoulder

B.I think he is a cold-blooded man

C.I think he is a cold fish

D.I'm likely to get cold feet小题2:If Sue shows absolutely no reaction to those awful pictures of starving children in Africa, you will say ______.

A.she is a cold-blooded killer

B.she gets cold feet

C.she is a cold fish

D.she is out in the cold小题3:We can use the expression "_____" to describe a man who abandons or hurts his lover without mercy.

A.cold-blooded

B.cold shoulder

C.cold feet

D.cold-hearted小题4:The topic of this passage is about _____.

A.the relationship between cold and our body

B.some expressions about friendship

C.some expressions connected with cold

D.how cold weather comes into being

单项选择题 案例分析题