13、月球的体积约为地球的四分之一。（请用“倍数/分数+the +名词”的结构将句子补充完整） The moon is about one-quarter ___________ the earth.
13、月球的体积约为地球的四分之一。（请用“倍数/分数+the +名词”的结构将句子补充完整） The moon is about one-quarter ___________ the earth.
参考答案和解析
A
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