单项选择题

I saw a traffic ______ last Friday.

A．accident
B．affair
C．damage
D．danger
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单项选择题
which of the following is NOT true according to the article
A．After they finish school, people must learn to be suitable to the many major changes that affect their lives.
B．Parents need to understand the best ways to educate children.
C．People need to understand how certain experiences change their behaviors.
D．Employees make use of the principles of learning to influence the behavior of employers.
单项选择题
What is the main idea about the second paragraph
A．Population and distribution.
B．Population and division.
C．Population and living.
D．Population and tribes.
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