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  3. In the people’s Republic of China the odd prequake behavior of horses and other animals【1】successfully to warn people that earth

In the people’s Republic of China the odd prequake behavior of horses and other animals【1】successfully to warn people that earth

admin2011-03-14  14
问题     In the people’s Republic of China the odd prequake behavior of horses and other animals【1】successfully to warn people that earthquakes【2】. Recently, a group of American geologists and geographers visited China and listened with great interest【3】the scientists there【4】explained how they have been able to predict many earthquakes in the past three years. The American scientists compared the【5】of the unique Chinese program【6】the impact of Chinese acupuncture【7】Western medicine.
    The Chinese scientists use【8】but they also monitor strange【9】such as various ground noises, the fluctuation of well-water levels, and the strange behavior of animals. The results are quite interesting, Chinese seismologists, for example,【10】predicted two magnitude 6.9 quakes near the China-Burma【11】on May 9,1976. The seismologists say that their predictions have been【12】precise that they were able to evacuate many of their people【13】an earthquake occurred,【14】saving thousands of lives.【15】, the Chinese experts also admit that there have been some false alarms.
    American scientists have【16】stories of unusual prequake animal behavior before, but they【17】them too seriously until their recent visit to China. "Maybe there’s【18】in it", said Jack Everndon, a California scientist. We need some kind of short-term warning. We need something.
    He didn’t mention the kind of research he may be considering, "Some of us are thinking it’s【19】enough to give it a serious look," he commented. "Two years ago we【20】that."  
选项 A、have, used
B、have been used
C、has been used
D、will be used
答案C
解析 has been used successfully to warn people已经被成功地用来预警，此处需要用现在完成时的被动语态，B．have been used单复数不对，句中主语为behavior，故为第三人称单数；其他答案不合题意。
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