According to the passage, it is difficult to be certain about the distant future of the universe because we ______. The word "t

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问题 According to the passage, it is difficult to be certain about the distant future of the universe because we ______.
The word "track" in the last paragraph most probably means ______.

选项 A、ways of life
B、marks of cars
C、orbits of planets
D、a course for racing.

答案A

解析 在最后一段中,作者谈到,当我们想到宇宙的未来,我们能够想到我们未来若干年后生活的道路,但对其具体情况却不得而知。根据题意,所选答案是正确选项。
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