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
The snow turns to ice when __________.
A．it gets wet
B．the next snowfall comes
C．the temperature gets colder
D．the snow above it is heavy enough
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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