It can be seen from the passage that ______. The main idea of the third paragraph is that ______.

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问题 It can be seen from the passage that ______.
The main idea of the third paragraph is that ______.

选项 A、a mature torpedo is capable of producing enough electricity to knock down a man
B、the mass of the fish decides the intensity of electric power it generates
C、the strength of shock given by a young electric ray can only light the bulb of a pocket flashlight
D、to make full use of the energy produced by electric fish, suitable wires should be available

答案B

解析 本题要求理解有关材料的中心思想。这一题也要求我们运用整体理解概括出中心并注意中心与细节的区别。我们可以看到第三段只有一句话,而主句是说“电击的强度取决于鱼的大小”,随后分别以具体事实对比了大小不同的鱼的发电量。所以B项“鱼的质量决定了它发电的强度”。反映了第三段的中心。其它三项都只描述一些细节。
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