单项选择题

In recent years there has been a () increase in the cost of living; many families have to depend on the federal aids.

A. ponderous
B. powerful

C. significant
D. violent

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单项选择题
The students take a () test in March, and the main exam is in July.

A. previous
B. preliminary
C. preceded
D. elementary
单项选择题
Different cultures are more prone to ______ certain illnesses because of the food that is characteristic in these cultures.
A. contract
B. conduct

C. confine

D. conquer
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