单项选择题

This is a very () situation and we don’t know how to face it yet.

A. comprehensive
B. compound
C. complicated
D. competent

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单项选择题

A. traditional American belief is that ().

A. few people live on farms
B. the nation consists mainly of small towns and wide open spaces
C. the population is the greatest in the world
D. the United States is a nation of big cities

单项选择题

A good title for this passage is ().

A. Sleep
B. Good Health
C. Dreams
D. Work and Rest