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
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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
单项选择题
Antarctica is called a desert because __________.
A．it is sandy
B．it has the same temperature as a desert
C．there has little moisture and has no lakes or rivers
D．few people live there
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