单项选择题

What does the author tell us in this passage

A．How trees help prevent droughts and floods.
B．The relationship between trees and man.
C．How an empire fell to pieces in ancient times.
D．A story of trees.

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热门试题

单项选择题

Why do forests in many parts of the world slowly disappear

A．New trees are not looked after properly.
B．Many trees have been cut down by man.
C．Man has not paid enough attention to planting trees.
D．All of the above.

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 shade.