单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．Late in the morning.
B．Early in the afternoon.
C．Sometime before dawn.
D．Shortly after sunrise.
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单项选择题
A．Pollution of the environment.B．A new generation of pest killers.C．Over-killing by hunters.D．Destruction of their natural homes.
A．Pollution of the environment.
B．A new generation of pest killers.
C．Over-killing by hunters.
D．Destruction of their natural homes.
单项选择题
A．Fifty underground stations were made waterproof.B．A flood wall was built.C．An alarm system was set up.D．Rescue teams were formed.
A．Fifty underground stations were made waterproof.
B．A flood wall was built.
C．An alarm system was set up.
D．Rescue teams were formed.
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