单项选择题

What is the most important service of trees to man according to the passage

A．They help him make money.
B．They give him wood and other products.
C．They help him prevent droughts and floods.
D．They give him shad
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单项选择题
A．because ofB．instead ofC．in spite ofD．as a result of
A．because of
B．instead of
C．in spite of
D．as a result of
单项选择题
A．efficientB．advancedC．delicateD．enough
A．efficient
B．advanced
C．delicate
D．enough
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