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 surface.

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热门试题

单项选择题

Which of the following is NOT mentioned as a possible cause of lung diseases

A．The burning of coal
B．Long-term exposure to smog
C．Exposure to nitrogen dioxide
D．Attending school camps

单项选择题

What is a terrible tool for activities such as sketching and painting

A．Technology
B．Typewriter
C．Text
D．The web