题目

信使RNA上决定氨基酸的某个密码子的一个碱基发生替换，则识别该密码子的tRNA及转运的氨基酸发生的变化是 A．tRNA一定改变，氨基酸一定改变        B．tRNA不一定改变，氨基酸不一定改变 C．tRNA一定改变，氨基酸不一定改变      D．tRNA不一定改变，氨基酸一定改变 答案：C 解析: 略 阅读理解 　　When we want to make friends in person, let’s stop a moment and consider what really makes a friend．The major qualities like faithfulness, devotion, friendliness flash through our minds．But it’s the large number of very small particular qualities that make up one’s whole character, such as cheerfulness, friendliness, and punctuality．After all,“to make a friend, to be a friend”is not such a big and difficult order．There are particular favorable qualities, which attract others to us, and some elements which do have an effect on people in fundamental psychology or not． 　　If you are in the presence of a shy person, talking and asking casual questions may bring him out of his shell．Think of what would be most acceptable to the other person for you to talk, or to listen．The goal is to make yourself pleasant． 　　Always remember to listen, but listen intelligently．To have anyone“hang on our words”isn’t the clever way in the world to please somebody．For a few extremely happy seconds we are the center of attraction, but when it’s our turn to be an audience, let’s remember how we felt as the actor, and let’s be really interested in what the other fellow is saying． 　　Other people will like us, if we like them．If you want friends, keep your mind and heart open to the friendship．Be alive to the other person’s world． (1) The general idea of this text is ________． [　　] A． the ways of talking to a shy person B． how to make a friend and be a friend C． how to make yourself attractive to your listeners D． some favorable qualities to be a psychologist (2) According to the text, what does the word“order”mean? [　　] A． A way of learning B． Command C． arrangement D． A sort of thing (3) The words“bring him out of his shell”in this text most probably means ________． [　　] A． help him understand the question better B． make him feel more nervous C． make him become active D． help him listen intelligently (4) According to the text, an important way in making friends is to ________． [　　] A． listen attentively B． be attracted C． attract them D． talk widely