2. 外语
  3. Why do we measure the distance in light-years instead of miles? This story is mainly about ______.

Why do we measure the distance in light-years instead of miles? This story is mainly about ______.

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问题 Why do we measure the distance in light-years instead of miles?
This story is mainly about ______.
选项 A、the distance between the sun and the other stars
B、the problems of traveling to faraway stars
C、what happens when we travel faster than the speed of light
D、the tool we use when we measure the distance of faraway stars
答案B
解析 主旨题。文章主要讲述了由于地球与其他星球之间的距离太远了，而且飞行速度也有一定的局限，所以人类很难到达遥远的星球，文中所举的例子均是说明人类登陆其他星球的困难。
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