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A．Because it has gone wrong.
B．Because there is no electricity.
C．Because the woman forgot to turn it on.
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单项选择题
A．A student at London University.B．A teacher at London University.C．A student at Beijing University.
A．A student at London University.
B．A teacher at London University.
C．A student at Beijing University.
单项选择题
From the passage, we can conclude that ______.
A．all trees give off the same amount of water into the air
B．the larger a tree is, the less water it will give off into the air
C．different kinds of trees give off different amount of water into the air
D．trees of the same kind give off different amount of water into the air
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