单项选择题

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 tree can be considered as a kind of pump in the following two ways: ______.
A．Making the ground far more loosely made up and increasing the humidity of the surrounding land.
B．Sucking up water from the ground and increasing the humidity of the surrounding land.
C．Sucking up water from the ground and keeping the surrounding land drier.
D．Making the ground far more lorry made up and keeping the surrounding land much drier.
单项选择题
A tree sucks up water through its ______.
A．roots
B．leaves
C．trunk
D．branches
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