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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单项选择题
During its growth, how much of the water from the soil does the tree give off into the air through its leaves
A．About ninety-nine percent.
B．About one percent.
C．About nine-tenths.
D．About one -ninth.
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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