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Everyone should learn something about first aid, because every second   in an emergency.
A.urgesB.costsC.needsD.counts
D
考查动词辨析。urge极力催促,cost花费,need需要,count重要,句意:每个人应该学一些急救知识,因为在紧急情况中每一秒都很重要。故选D。
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