单项选择题

Without reading the operating instruction carefully,workers will find it difficult to handle the machine．

A．如果工人不按要求阅读说明书，他们很难把握这个机器。
B．如果工人们不认真看手术指南，他们会觉得难以搞定这个机器。
C．如果工人们不仔细看书，他们会很难解决这个机器。
D．如果工人们没有仔细阅读操作说明书，他们会觉得难以搞定这个机器。
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单项选择题
Why do some people organize parties and activities()

A. Because they have too much time.
B. Because they think it is the only way for them to express themselves.
C. Because they think it is a good way to get to know each other better.
D. Because they believe that those anniversaries have specific meanings.
单项选择题
The passage is mainly about().

A. the damaged environment
B. the causes of environmental problems
C. global warming and air pollution
D. encouraging people to protect the environment
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