单项选择题
How long has Nick been working in China
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A.About five months.
B.Less than five years.
C.About five years.
D.More than five years.
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单项选择题
What is the most important reason of natural imbalance
A.The greed and poor planning of people.
B.The increase of desert.
C.The increase in numbers of hunters.
D.The disease spreading among animals.
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单项选择题
What is this dialogue about
A.Teachers should set good examples.
B.Environmental pollution and protection in China.
C.People"s effort in protecting environment.
D.Government"s role in environmental protection.
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