单项选择题

Science and technology have ______ in important ways to the improvement of agricultural production.

A．attached
B．assisted
C．contributed
D．witnessed
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单项选择题
Most people agree that the present role of women has already affected U.S. society ______ it has affected the traditional role of men.
A．Above all
B．In all
C．At most
D．At last
单项选择题
Salaries for ______ positions seem to be higher than for permanent ones.
A．legal
B．optional
C．voluntary
D．temporary
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