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  3. The primary focus of the passage is on which of the following? It can be inferred from the passage that which of the following

The primary focus of the passage is on which of the following? It can be inferred from the passage that which of the following

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问题 The primary focus of the passage is on which of the following?
It can be inferred from the passage that which of the following would most probably be observed during the Earth’s passage through a meteor stream if the conventional theories mentioned in line 18 were______
选项 A、Meteor activity would gradually increase to a single, intense peak, and then gradually decline.
B、Meteor activity would be steady throughout the period of the meteor shower.
C、Meteor activity would rise to a peak at the beginning and at the end of the meteor shower.
D、Random bursts of very high meteor activity would be interspersed with periods of very little activity.
E、In years in which the Earth passed through only the outer areas of a meteor stream, meteor activity would be absent.
答案A
解析 This question asks you to make an inference about what would most probably be observed during the Earth’s passage through a meteor stream if the conventional theories mentioned in the passage were correct. According to line 18-20, the conventional theories predicted that the meteor stream would be most dense at the center. The computer model, one the other hand, predicted that a meteor stream would come to resemble a thick-walled, hollow pipe (lines 21-22). The passage states that, if the computer model were correct, two peak periods of meteor activity would be observed as the Earth passed through the walls of the “pipe” (lines 28-31). According to lines 36-38, observational data confirmed the prediction of the computer model. If, on the other hand, the conventional theories were correct, it can be inferred that a bifurcation of meteor activity would not be observed; instead, it can be inferred that scientists would expect to observe a single peak of meteor activity as the Earth passed through the dense center of the stream. Choice A identifies this single peak of activity as the most likely observation if the conventional theories were correct. Choice B and D are not correct because they describe meteor activity that is either steady or erratic, neither of which is consistent with the conventional theories. Choice C describes meteor activity more in line with the bifurcation predicted by the computer model, rather than the single peak of activity that the conventional theories would suggest. Choice E is incorrect because the passage says that meteor showers occur whenever the Earth passes through a meteor stream; it cannot be inferred that either theory would predict otherwise.
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