单项选择题

Some deserts were once ______.

A．very good lands
B．covered by ice
C．very cold
D．dry and useless
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单项选择题
From the passage, we know that man must ______.
A．do nothing to keep the balance (平衡)of nature
B．try his best to change the balance of nature
C．try his best to keep the balance of nature
D．do his best to stop the balance of nature
单项选择题
Some of what Jules described in his books ______.
A．is almost the same as what happened years later
B．is quite different from what happened years later
C．never comes true
D．seems impossible to the people today
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