题目内容
7．Everyone should play a part in saving the ．（ ）| A． | moon | B． | sun | C． | earth | D． | star |
分析 我们每个人在保护地球方面都起着重要作用．
解答 答案：C，考察名词辨析．句中用到句式"play a part in doing sth"表示在…方面起到重要作用，根据saving可知使拯救某一东西，moon（月亮）、sun（太阳）和star（星星）离我们太遥远，就算我们想保护也无能为力，所以应该是保护我们赖以生存的地球，因此选择C．
点评 考察名词辨析，应根据上下文内容加以确定．
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