It is important to keep ______ in an emergency (緊急情況).
A．quietB．calmC．silentD．still
B

試題分析：句意：在緊急情況下，保持鎮(zhèn)定很重要。quiet安靜；calm心情平靜；silent沉默；still靜止不動(dòng)。結(jié)合句意，選B。
考點(diǎn): 考查形容詞的用法。
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