The weight of the moon is only about ______ of that of the earth.

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问题 The weight of the moon is only about ______ of that of the earth.

选项 A、one eighty
B、one of eighty
C、one the eightieth
D、one eightieth

答案D

解析 先用基数词读分子,再用序数词读分母,二者间不需冠词。
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