题目

酵母菌既能进行有氧呼吸，又能进行无氧呼吸，如果两种呼吸都分解葡萄糖产生等量的二氧化碳，则所消耗的葡萄糖之比为（ ） A、1∶2 B、2∶1 C、1∶3 D、3∶1 答案：C 解析: 酵母菌有氧呼吸的反应式是：C6H12O6＋6O2→6CO2＋6H2O＋能量；无氧呼吸的反应式是：C6H12O6→2C2H5OH（酒精）＋2CO2＋能量。根据题意，我们假定都产生6个分子的CO2，则有氧呼吸过程消耗的葡萄糖是1分子，而无氧呼吸过程则必须消耗3分子葡萄糖。因为无氧呼吸有机物分解得不彻底，1分子葡萄糖经酒阅读下面的短文，请根据短文后的要求答题（请注意问题后的词数要求）。 In the modern society there is a great deal of argument about competition. Some value it highly ,believing that it is responsible for social progress and prosperity(繁荣). Others say that competition is bad ,that it sets one person against another, that it leads to unfriendly relationship between people. I have taught many children who held the belief that their self-worth relied on how well they performed at tennis and other skills. For them, playing well and winning are often life-and death affairs. In their single-minded pursuit of success, the development of many other human qualities is sadly forgotten. However, while some seem to be lost in the desire to succeed, others take an opposite attitude. In a culture which values only the winner and pays no attention to the ordinary players, they strongly blame competition. Among those who complain most are youngsters who have suffered under competitive pressures from their parents or society. Teaching these young people, I often observe in them a desire to fail. They seem to seek failure by not trying to win or achieve success. By not trying, they always have an excuse: "I may have lost, but it doesn't matter be cause I really didn't try. "What is not usually admitted by them is the belief that if they had really tried and lost, ________________ . Such a loss would be the measure of their worth. Clearly, this belief is the same as that of true competitors who try to prove themselves. Both are based on the mistaken belief that one's self-respect relies on how well one performs in comparison with others. Both are afraid of not being valued. Only as this basic and often troublesome fear begins to dissolve(缓解) can we discover a new meaning in competition. 76. What does this passage mainly talk about? (Please answer within 15 words. ) ________________________________________________________________________________________________________________. 77. Which sentence in the passage can be replaced by the following one? Although it seems that some are dying to succeed, others think differently. _______________________________________________________________________________________________________________. 78. Please fill in the blank in the 3rd paragraph with proper words or phrases to complete the sentence. (Please answer within 10 words.) _______________________________________________________________________________________________________________. 79. What's your attitude toward competition? (Please answer within 30 words. ) _______________________________________________________________________________________________________________ _______________________________________________________________________________________________________________ 80. Translate the underlined sentence in the 3rd paragraph into Chinese. _______________________________________________________________________________________________________________.