单项选择题

What do we learn about deserts from this text

A．Deserts can change into green and fertile areas.
B．Certain areas have always been desert.
C．Deserts were once the home of elephants and giraffes.
D．Deserts have been growing since the beginning of the worl

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单项选择题

How much of the world's land surface is at risk of becoming desert

A．Less than ten million square kilometers.
B．Twenty million square kilometers.
C．Mom than twenty million square kilometers.
D．30% of the world's land surfac

单项选择题

What does the writer think about the creation of new desert areas

A．It is a natural development.
B．The problem is not very serious.
C．It is a very worrying problem.
D．The situation will improve in tim