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【单选题】
北京时间2007年11月6日11时21分34秒，嫦娥一号卫星成功实施了第2次近月制动，进入周期为3．5小时的月球椭圆轨道……下列说法正确的是（）A.
11时21分34秒是时间
B.
3.5小时是时刻
C.
在观测卫星绕月运行周期时可将其看成质点
D.
卫星绕月球做椭圆运动，这是以地球为参考系来描述的
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A.
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B.
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C.
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A.
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B.
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C.
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D.
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A.
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B.
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A.
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B.
Taxi drivers.
C.
Waiters.
D.
Fruit sellers,
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