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We all understand that learning a foreign language ______ time and efforts.
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This skirt l_______ so nice. How much is it.
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如图,质量为800kg的小轿车,每个轮胎与地面的接触面积为200cm^2. 小轿车对水平地面的压强是多大?(g取10N/kg)
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选出不同类的单词( ) A . her B . their C . yours
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I can never forget the days ________we spent together in the summer camp.
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