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Should College Students Be Encouraged to Get Married Nowad......

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单项选择题
What is the real cause of the potential water crisis
A．Only half of the world’’s water can be used.
B．The world population is increasing faster and faster.
C．Half of the world’’s water resources have been seriously polluted.
D．Humanity has not placed efficient value on water resources.
单项选择题
Why does the author say that nothing was wasted before the invention of fridge
A．People would not buy more food than was necessary.
B．Food was delivered to people two or three times a week.
C．Food was sold fresh and did not get rotten easily.
D．People had effective ways to preserve their food.
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