单项选择题

A．Half a year ago.
B．Two months ago.
C．One month ago.
D．Two weeks ago.
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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.
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.
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.
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