The moon moves round the earth once a________．(空白處填入一詞，使句子結(jié)構(gòu)完整，意思正確)

答案：month
解析：

思路分析：根據(jù)天文知識，月球環(huán)繞地球運轉(zhuǎn)，一個月為一周期，故此空應(yīng)填month．


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閱讀下面短文，根據(jù)短文內(nèi)容選擇最佳答案．

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