问题 选择题

细菌、真菌和病毒的共同特点是(  )

A.都对人类有益

B.都是孢子生殖

C.都是单细胞生物

D.都能利用现成的有机物

答案

细菌的基本结构有细胞壁、细胞膜、细胞质和DNA集中的区域,没有成形的细胞核,没有叶绿体;真菌的基本结构有细胞壁、细胞膜、细胞质、细胞核,没有叶绿体;病毒同所有生物一样,具有遗传、变异、进化,是一种体积非常微小,结构极其简单的生命形式.病毒没有细胞构造,主要由内部的核酸和外部的蛋白质外壳组成,不能独立生存,只有寄生在活细胞里才能进行生命活动,一旦离开就会变成结晶体.

A、细菌、真菌、病毒对人类有利也有害,故该选项不符合题意.

B、细菌是分裂生殖,真菌进行孢子生殖,病毒以宿主细胞内物质为原料进行自身遗传物质的复制.故该选项不符合题意;

C、细菌是单细胞的,真菌有单细胞也有多细胞的,病毒没有细胞结构,故该选项不符合题意;

D、细菌、真菌、病毒体内,都没有叶绿体,都不能进行光合作用,大都利用现成的有机物维持生活,营养方式是异养,故该选项符合题意;

故选D

单项选择题
阅读理解

What exactly is a lie ?Is it anything we say which we know is untrue ?Or is it something more than that ?For example, suppose a friend wants to borrow some money from you. You say “I wish I could help you, but I am short of money myself.” In fact , you are not short of money but your friend is in the habit of not paying his debts and you don’t want to hurt his feelings by reminding him of this. Is this really a lie ?

Professor Jerald Jellison of the University of southern California has made a scientific study of lying. According to him, women are better liars than men, particularly when telling a “white lie”, such as when a woman at a party tells another woman that she likes her dress when she really thinks it’s terrible. However, this is only one side of the story. Other researchers say that men are more likely to tell more serious lies, such as making a promise that they have no intention of carrying out. This is the kind of lie politicians and businessmen are supposed to be particularly skilled at :the lie from which the liar hopes to profit or gain in some way.

Research has been done into the way people’s behavior changes in a number of small, unimportant ways when they lie. It has been found that if they are sitting down at the time, they tend to move about in their chairs more than usual. To the trained observer they are saying “I wish I were somewhere else now”. They also tend to touch certain parts of the face, particularly the nose. One explanation of this may be that lying causes a slight increase in blood pressure. The tip of the nose  is very sensitive to changes and the increased pressure makes it itch.

Another gesture that gives liars away is what the writer Decmond Morris in his book Man Watching calls the “mouth cover”. He says that there are several typical forms of this ,such as covering part of the mouth with the fingers, touching the upper lip or putting a finger of the hand at one side off the mouth. Such a gesture can be understood as an unconscious(未察觉的) attempt on the part of the liar to stop himself from lying.

Of course, such gestures as rubbing the nose or covering the mouth , moving about in a chair can not be taken as proof that the speaker is lying. They simply tend to happen more often in this situation. It is one gesture alone that gives the liar away but a whole number of things , and in particular the context(上下文) which the lie is told.

小题1:According to the passage, a white lie seems to be a lie ______.

A.that other people believe

B.that other people don’t believe

C.told in order not to hurt someone’s feelings

D.told in order to take advantage of someone小题2:Research suggests that women _____.

A.are better at telling less serious lies than men

B.generally lie for more than men do

C.often make promises they intend to break

D.lie at parties more often than men do小题3:Researchers find that when a person tells lies _____.

A.his blood pressure increases measurably

B.he looks very serious

C.he is likely to make some small changes in his behavior

D.he uses his unconscious mind小题4:The writer of the passage______.

A.hates lying

B.enjoys lying

C.often tells a lie

D.tries to study about lying小题5:Which of the following is not mentioned in the passage as a sign of lying ?

A.Touching one’s ears

B.Rubbing the nose

C.Moving in a chair

D.Covering the mouth