单项选择题

Which of the following is the best title for the passage（）

A．An Extensive Collection of Glass Flowers.
B．The Live Leopold and Rudolph Blaschka.
C．Flowers Native to the United States.
D．Materials Used for Artificial Flowers.

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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

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