题目

如图所示，实验室里有一套用来制取气体的装置，下列有关叙述正确的是（） A．锥形瓶里加入少量MnO2粉末，分液漏斗里盛放过氧化氢溶液，可以制取氧气B．锥形瓶里加入大理石，分液漏斗里盛放稀硫酸，可以制取二氧化碳C．当发生装置中液体与固体混合产生了气泡，立即开始收集气体D．集满氧气的集气瓶从水槽里取出后倒放在实验台上 请阅读下列短文，从每题所给的四个选项（A、B、C、D）中，选出最佳选项。 　　In modern society there is a great deal of argument about competition．Some valueit highly,believing that it is responsible for social progress and prosperity．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（赖）on how well they performed at tennis and other skills．For them,playing well andwinning are often life— and— death affairs．In their single— minded pursuit（追求）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 atticude．In a culture which values only the winner and pays no attention to the ordinary players,they strongly blame competition．Among the most vocal are youngsters who have suffered under competitive pressure 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 because I really didn't try．”What is not usually admitted by themselves is the belief that if they had really tried and lost,that would mean a lot．Such a loss would be a measure of their worth．Clearly,this belief is the same as that of the true competitors who try to prove themselves．Both are based on the mistaken belief that one's self— respect relies on howwell 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． (1) What does this passage mainly talk about? [　　] A． Competition helps to set self — respect． B． Opinions about competition are different among people． C． Competition is harmful to personal quality development． D． Failures are necessary experiences in competition． (2) Why do some people favor competition according to the passage? [　　] A． It pushes society forward． B． It builds up a sense of duty． C． It improves personal abilities． D． It encourages individual efforts． (3) The underlined phrase“the most vocal”in Paragraph 3 means ________ [　　] A． those who try their best to win B． those who value competition most highly C． those who are against competition most strongly D． those who rely on others most for success (4) What is the similar belief of the true competitors and those with a“desire to fail”? [　　] A． One's worth lies in his performance compared with others B． One's success in competition needs great efforts C． One's achievement is determined by his particular skills D． One's success is based on how hard he has tried (5) Which point of view may the author agree to? [　　] A． Every effort should be paid back B． Competition should be encouroged C． Winning should be a life — and — death matter D． Fear of failure should be removed on competition