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  3. The passage is mainly about______. According to the passage the low-Earth orbit is______.

The passage is mainly about______. According to the passage the low-Earth orbit is______.

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问题 The passage is mainly about______.
According to the passage the low-Earth orbit is______.
选项 A、the destination for most commercial payloads
B、a few hundred kilometers above the earth
C、about 36,000 kilometers away above the earth
D、a few hundreds kilometers above the geo-stationary orbit
答案D
解析 细节题。题意为："根据本文，近地轨道是______"。根据文章第五段第二句(大多数商业卫星拥挤在地球静止轨道上，它位于赤道以上36000公里，或者拥挤在近地轨道上，它位于地球静止轨道以上几百公里)，可知答案选项正确。
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