单项选择题

A．Whether it can be detected and checked.
B．Whether it will lead to widespread food shortage.
C．Whether global warming will speed up in the future.
D．Whether it will affect their own lives.
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单项选择题
A．They extend their water pipes.B．They give out faint cries.C．They make noises to drive away insects.D．They become elastic like rubber bands.
A．They extend their water pipes.
B．They give out faint cries.
C．They make noises to drive away insects.
D．They become elastic like rubber bands.
单项选择题
A．Have to buy a special electronic ticket.B．Have to travel a long way to visit the university.C．Need an expensive device designed especially for the museum.D．Need a computer linked to a telephone.
A．Have to buy a special electronic ticket.
B．Have to travel a long way to visit the university.
C．Need an expensive device designed especially for the museum.
D．Need a computer linked to a telephone.
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