单项选择题

The things brought down by rivers from the mountains that are useful for cultivation are （）

A．deltas
B．crops
C．fresh water life
D．soil and minerals

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单项选择题

In which area have Americans received the most awards（）

A．Literature.
B．Peace.
C．Economics.
D．Scienc

单项选择题

The most serious problem man is facing is thought to be （）

A．the using of the earth’s resources
B．the control over the waste of the natural materials
C．how to slow down the increase of population
D．how to stop the birth of new babies