单项选择题

The snow in Antarctica is very deep because it __________.

A．never stops falling
B．piles up year after year
C．never melts
D．both Ｂ)and Ｃ)
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单项选择题
Antarctica has __________.
A．ten times as much moisture as the Sahara
B．the same mount of moisture as the Sahara
C．about one-tenth of the moisture as the Sahara
D．none of the above
单项选择题
The best title for the passage is __________ .
A．A Strange Continent
B．An Ice Continent
C．Snowfall at the South Pole
D．The World's Desert
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