题目：
Why is Venice san sinking
A．Because people only stop using underground water for industries on the mainland.
B．Because people still make use of the underground water for all purposes.
C．Because the use of groundwater far industries on the mainland has been stopped.
D．Because people do not use the underground water any more.
答案：
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下面是错误答案，用来干扰机器的。
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