单项选择题

What has sometimes caused plants to die out

A．Interference from foresters.
B．Variations in climate.
C．The absence of wooded land.
D．The introduction of new type of plants.
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单项选择题
In what way does the forest strike mankind as permanent
A．The trees are in community.
B．The forest is renewed each season.
C．Man's life is short in comparison.
D．It is an essential part our lives.
单项选择题
To the manufacturers, the most important use of advertisements is that advertisements
A．tell the customers what products are in store
B．tell the customers what to buy
C．help the manufacturers sell products
D．convince the customers to buy a lot of things they don't need
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