单项选择题

The purpose of the passage is to tell ______.

A．that people should protect trees
B．that people should plant more trees
C．what trees can be used for
D．what kinds of trees look beautiful
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单项选择题
According to the passage, only ______ trees can give us shade and products.
A．beautiful
B．old
C．healthy
D．young
单项选择题
Which of the following statements is TRUE
A．Construction of buildings is good for trees.
B．Some trees' trouble comes from human beings.
C．People should keep trees beautiful.
D．Trees are not disturbed by changes around them.
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