People do not analyze every problem they meet. Sometimes they try to remember a solution from the last time they had a【C1】_____

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问题     People do not analyze every problem they meet.  Sometimes they try to remember a solution from the last time they had a【C1】________problem. They often accept the opinion or ideas of other people.  Other  times they begin to act without【C2】________They try to find a solution by trial and error.    However, when all of these methods【C3】________, the person with a problem has to start analyzing.   There are six【C4】________in analyzing a problem.
    【C5】________, the person must recognize that there is a problem. For example, Sam’s bicycle is broken, and he cannot ride it to class as he usually does. Sam must【C6】________that there is a problem with his bicycle.
    Next, the person must【C7】________the problem. Before Sam can repair his bicycle, he must know why it does not work.  For example, he must【C8】________the parts that are wrong.
    Now the person must look for【C9】________that will make the problem clearer and lead to 【C10】________solutions. For example, suppose Sam【C11】________ that his bike does not work because there is something wrong with the brakes.【C12】________, he can look in his bicycle repair book and read about brakes, talk to his friends at the bike shop, or look at his brakes carefully.
    After【C13】________the problem, the person should have several suggestions for a possible solution. Take Sam as an example【C14】________ , his suggestions might be: tighten or loosen the brakes; buy new brakes and change the old ones.
    In the end, one【C15】________seems to be the solution to the problem. Sometimes the【C16】________idea comes quite【C17】________because the thinker suddenly sees something in a【C18】________way. Sam, for example, suddenly sees there is a piece of chewing gum stuck to a brake. He immediately hits on the solution to his problem; he must【C19】________the brake.
    Finally the solution is【C20】________Sam does it and finds his bicycle works perfectly. In short he has solved the problem.
【C19】

选项 A、clean
B、separate
C、loosen
D、remove

答案A

解析 去掉口香糖的方法是清理车闸。
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