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
Stable political conditions and freedom (from) foreign invasion enable a country to develop its natural resources peacefully and steadily, and (to produce) more wealth than (the other) country equally well served by nature but (less well) ordered.
A. from
B. to produce
C. the other
D. less well
单项选择题
Multimedia computers ______.
A．can process anything but digital data
B．can even process television images
C．are rarely used in education
D．have few business applications
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