单项选择题

A tree sucks up water through its ______.

A．roots
B．leaves
C．trunk
D．branches
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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
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.
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