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
According to the passage, ______.
A．a long time ago, man did not know how to make use of wood
B．trees are not as useful as they were in the past
C．trees were more found in the past than they are today
D．people have 'always found trees useful
单项选择题
The thing Jules described in his book From the Earth to the Moon is ______.
A．as large as the spaceship today.
B．similar to the spaceship today.
C．a gun used to send up a ship.
D．an underwater ship.
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