One can’t do extreme sports _________ he or she has had some training.
A.ifB.unlessC.onceD.since
B

試題分析:句意:一個人不能做極限運(yùn)動,除非他或她進(jìn)行過一些培訓(xùn)。If如果; unless除非; once一旦; since自從,因為。根據(jù)句意故選B。
點評:本題難度適中。連詞是近幾年高考?嫉恼Z法項目,主要考查的是它們的用法及意義,還需正確理解句意及正確分析句子的成分才能做出正確的判斷。這里考生容易誤選A。
即學(xué)即練:All the dishes in this menu,_________ otherwise stated, will serve two to three people.
A. as        B. if      C. though       D. unless
解析:D。句意:考查連詞的用法。句意為:除非有特別的說明,要不然這個菜單上的所有的菜只供兩到三個人食用。unless表示“如果不……,除非……”,符合句意。
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