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平行結(jié)構(gòu)

1.While tobacco is linked to about 30 percent of cancer cases,diet is involved in an estimated 25 percent and alcohol_______about six percent.

A.atB.inC.of D.for

2.A controversial aspect of"defriending"is that,unlike with other applications such as the"what are you thinking about?"posting a digital depository of the often dire,        ,dull and desperate,

A.exciting B.drearyC.cheerfulD.bright

3.The survey and __________ appear in the April 15th issue of the Journal of the American Medical Association.

A.analyze B.analysis C.having analyzed D.be analyzed