单选题
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.
【正确答案】
B
【答案解析】
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