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

People protect their environment by（）

A．cutting down unhealthy trees
B．making changes around the trees
C．cooling and cleaning the air around the trees
D．protecting the environment for trees growth

单项选择题

（）worked harder, he would have passed the exam.

A．He had
B．When he
C．If he
D．Had he