单项选择题

(By the 1980s) more than (two-fifth of) U.S. crop production was exported, (making) U.S. agriculture heavily (dependent) upon international markets.

A．By the 1980s
B．two-fifth of
C．making
D．dependent
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单项选择题
Chaucer, (whose) Canterbury Tales is one of the (most extraordinary) works in English, practically created, (or) at least (made it acceptable), a new language.
A．whose
B．most extraordinary
C．or
D．made it acceptable
单项选择题
(While) smoking was associated with an attention of weight gain among black adults, (no such effect) occurred among white men or women, the latter (was) the group (most likely) to smoke for weight control.
A．While
B．no such effect
C．was
D．most likely
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