单项选择题

This passage mainly talks about （）.

A．the origin of the earth
B．the origin of the ocean
C．the history of the earth
D．the forming of the earth’s crust

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单项选择题

According to the passage, your mental ability （）.

A．depends on your attitude towards people in different time of the year
B．changes for the worst when you dislike most people in hot season
C．will be best in winter and worst in summer if you want to be creative
D．turns to be more powerful in spring than in any of the other seasons

单项选择题

There is a heated debate among American experts because（）

A．America has put 2 million people in prison
B．the cost for housing a prisoner keeps rising
C．billions of dollars has been spent on prisoners
D．the prisoner population is the largest in the world