题目

有关人的成熟红细胞的叙述不正确的是 A . 是提取纯净细胞膜的理想材料 B . 进行无丝分裂 C . 是观察动物细胞发生渗透作用的理想材料 D . 吸收葡萄糖不需要消耗能量 答案：B阅读下面短文，并根据短文后的要求回答问题（请注意问题后的字数要求）。[l]Fear and pain are two of the most useful things that human beings and animals have, if they are properly used. If fire did not hurt when it burnt, children would play with it until their hands were burnt away. Similarly, if pain existed but fear didn’t, a child would burn himself again and again, because fear would not warn himself to keep away from the fire that had burnt himself before. A really fearless soldier is not a good soldier because he will soon be killed; and a dead soldier is of no use to his army. Fear and pain are therefore two guards without which human beings and animals might soon die out. [2] In our first sentence we suggested that fear should be properly used. If, for example, you never go out of your house because of the danger of being knocked down and killed in the street by a car, you are letting fear rule you too much. Even in your house you are not absolutely safe: A plane may crash on your house, or you may get cancer![3] The important thing is not to let fear rule you, but to use fear as your servant and guide instead. Fear will warn you of dangers; then you have to decide what action to take.[4] In many cases, you can take quick and successful action to avoid the danger. For example, you see a car coming straight towards you. Fear warns you, then you jump out of the way, and all is well.[5] In some cases, however, you decide that there is nothing that you can do to ___________. For example, you can’t prevent a plane crashing onto your house. In this case, fear is no longer of any use, and you have to try to overcome it.【小题1】What is mainly talked about in this passage? (no more than 15 words)_________________________________________________________________________【小题2】How does the author support his idea in Paragraph 2? (no more than 5 words)_________________________________________________________________________【小题3】Why does the author say that a fearless soldier is not a good soldier? (no more than 15 words)_________________________________________________________________________【小题4】 What benefit can we get from “fear” according to the passage? (no more than 10 words)__________________________________________________________________________【小题5】Fill in the blank in Paragraph 5 with proper words. (no more than 5 words)__________________________________________________________________________