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
During the voyage, Darwin collected a good deal of information about living things, which ______led to his famous book On the Origin of Species .
A. lastly
B. completely
C. essentially
D. eventually
单项选择题
Millions do it. in this sentence do it refers to（）

A．feeling uncomfortably hot on the equator
B．flying over the North Pole
C．flying over the equator
D．making homes on the equator
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