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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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)
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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