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地下水污染源按形成原因可分为（ ）污染源和（ ）污染源。
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【简答题】Why do people believe that TV has something to do with increasing violence?
【单选题】Why People Buy Why do people buy? Why do people choose to buy certain products? These are important questions for manufacturers and businesses. One of the reasons is advertising. Manufacturers know th...
A.
Y
B.
N
C.
NG
【单选题】Q: Why do British people prefer houses to flats?
A.
Houses are much more quiet.
B.
They want to have more space.
C.
They want a garden of their own.
D.
Houses provide more privacy.
【简答题】Why do people worry about the s?（ ）
【单选题】—I wonder _______ pet fish. —They are a pleasure to watch.. [ ]
A.
why people keep
B.
why do people keep
C.
where people keep
D.
where do people keep
【简答题】Why do millions of people say 'no' to the Internet?
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