答案:D

　　解析:细节理解题。文章最后一句说,如果这种循环继续下去的话,我们国家在几代人之后就会一败涂地。因此D项正确。

　　28.

　　C

　　(2017辽宁五校协助体联考)

　　One day,I received a call from a colleague.He was about to give a student a zero for his answer to a physical problem,while the student claimed a perfect score.I was elected as their arbiter(仲裁人).I read the examination problem:“Show how it is possible to determine the height of a tall building with the aid of a barometer(气压计).” The student had answered:“Take the barometer to the top of the building,attach a long rope to it,lower it to the street,and then bring it up and measure the length of the rope.The length of it is the height of the building.”

　　The student had really answered the question completely,but the answer didn’t confirm his competence in physics.I suggested the student try again.I gave him six minutes to answer the question,warning that the answer should show some knowledge of physics.Five minutes later,he said he had many answers and dashed off one,which read:“Take the barometer to the top of the building and lean over the edge of the roof.Drop the barometer,timing its fall with a stopwatch.Then,use the physical formula(公式) to calculate the height of the building.”

　　At this point,my colleague had to accept it,and then the student made almost a full mark.I couldn’t help asking the student what the other answers were.He listed many others,and then added,“Probably the best one is to take the barometer to the administrator and say to him,‘Sir,here is a fine barometer.If you tell me the height of the building,I will give it to you.’”

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