【单选题】【消耗次数：1】
A well written composition ____ good choice of words and clear organization among other things.
①
calls for
②
calls on
③
calls up
④
calls off
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相关题目
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A well written composition _____ good choice of words and clear organization among other things.
①
calls for
②
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③
calls up
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calls off
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He __________ five telephone calls to his parents.
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随机题目
【单选题】
采用吸附TLC法分离混合组分时，选择合适的分离系统(固定相与流动相)的目的在于
①
使Rf值在0.3～0.5范围内
②
分离开各组分且Rf值在0.2～0.8范围
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