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

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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

The soldiers had been marching __________ in the square.

A．high and low
B．forward and backward
C．round and round
D．again and again