单选题
If an object weighed one pound 8,000 miles above the earth, it would weigh ______ on the surface of the earth.
【正确答案】
D
【答案解析】[解析] 从第三句第二句If you treble the distance,it gets nine times weaker (three times three)可知,如果距离变为原来的三倍,那么物体的重量就减少到原来的九分之一。故D为正确答案。