The same gestures, signs and so on, in other words, body language, may express different ideas or meanings in different cultures, so don’t use them _______ you are definitely sure of what they mean so as to reduce misunderstanding ______ the smallest number.A.until; withB.unless; toC.until; byD.unless; by
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B解析第一空考查连词,unless是除非,第二空考查介词的用法:reduce sth to“把…减少到一定程度”,句意是:同样的手势,标准,也就是肢体语言,可能在不同国家不同文化有不同意思,因此,为了把误解降到最低,不要使用它们除非你知道它们的意思。选B。