2. 外语
  3. The primary focus of the passage is on which of the following? It can be inferred from the last paragraph of the passage that w

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

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问题 The primary focus of the passage is on which of the following?
It can be inferred from the last paragraph of the passage that which of the following must be true of the Earth as it orbits the Sun?
选项 A、Most meteor streams it encounters are more than 2,000 years old.
B、When passing through a meteor stream, it usually passes near to the stream’s center.
C、It crosses the Geminid meteor stream once every year.
D、It usually takes over a day to cross the actual Geminid meteor stream.
E、It accounts of msot of the gravitaitonal perturbation affecting the Geminid meteor stream.
答案C
解析 This question asks you to draw an inference from information in the last paragraph of the passage. The best answer is C. According to the passage, the Geminid meteor shower occurs yearly; because meteor showers occur whenever the Earth passes through a meteor stream, one can infer that the Earth crosses the Geminid stream once every year. Choice A is incorrect because the passage provides no information from which to generalize about the age of meteor streams. Choice B, which is directly contradicted by lines 31-32, is also incorrect. Choice D is incorrect. In lines 25-28, the passage says that the Earth would take just over a day to cross the stream if the stream were 5,000 years old. However, in lines 38-42 the passage states that in fact an average of only 19 houses elapsed between the time that the Earth entered the stream until the time that it exited, leading researchers to conclude that the stream is only about 3,000 years old. Choice E is incorrect because the passage says only that planetary gravitational fields perturb the orbits of dust particles in a meteor stream; it does not say that the effect of the Earth’s gravitation is greater than that of other planets.
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