完形填空平行结构 While tobacco is linked to about 30 percent
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B.对应前面的be involved in , 因为有个and ,表示并列.

B.dire, dull and desperate这几个都是负面词汇,然后他们又是并列的关系,当然只能选同样有负面意义的词汇.ACD各表示令人兴奋的,令人愉快的,欢快的.而是dreary乏味的.

B.该处是与survey并列的主语,用名词等.anylysis 是分析(n).