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  3. How much would four pounds of tea weigh if it was taken 4,000 miles out from the surface of the earth? According to the passage

How much would four pounds of tea weigh if it was taken 4,000 miles out from the surface of the earth? According to the passage

admin2012-12-22  71
问题 How much would four pounds of tea weigh if it was taken 4,000 miles out from the surface of the earth?
According to the passage, "weight" should be understood in the sense that
选项 A、it is fixed if it is outside the earth’s gravitational pull.
B、it decreases four times when it is 4,000 miles from the earth’s center.
C、it varies with the change of the gravitational attraction between two objects.
D、things increase in amount as they are closer to the earth’s surface.
答案C
解析
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