单项选择题

A．He didn’t like physics any more.
B．His eyesight was too poor.
C．Physics was too hard for him.
D．He had to work to support himself.
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单项选择题
A．The threat of poisonous desert animals and plants.B．The exhaustion of energy resources.C．The destruction of oil wells.D．The spread of the black powder from the fires.
A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black powder from the fires.
单项选择题
A．His friend gave him the wrong key.B．He didn’t know where the back door was.C．He couldn’t find the key to his mailbox.D．It was too dark to put the key in the lock.
A．His friend gave him the wrong key.
B．He didn’t know where the back door was.
C．He couldn’t find the key to his mailbox.
D．It was too dark to put the key in the lock.
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