单项选择题

第一节 听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 Why is the heating not turned on

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 sucks up water through its ______.
A．roots
B．leaves
C．trunk
D．branches
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.
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