Everyone should learn something about first aid, because every second   in an emergency.
A．urgesB．costsC．needsD．counts
D
考查動詞辨析。urge極力催促，cost花費，need需要，count重要,句意：每個人應(yīng)該學(xué)一些急救知識，因為在緊急情況中每一秒都很重要。故選D。
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