单选题：What happened in the 1970s?

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题目内容：
What happened in the 1970s? A．The US government recommended the amount of food a restaurant gave to a customer.
B．Health experts persuaded restaurants to serve smaller portions.
C．The United States produced more grain than needed.
D．The American waistline started to expand.

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What happened in the 1970s?A The US government called on i

What happened in the 1970s?A The US government called on its people to reduce

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根据以下短文，回答题。第一篇 Calling for Safe CelebrationsLast Fourth of July，Pete，a 14-year-o

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A ．welcomed　B．celebrated　C．prasied　D．favored

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What is the result of the experiment with rats and mice car

What is the result of the experiment with rats and mice carried out at Rutgers

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Depression in older people is strongly linked with----------

Depression in older people is strongly linked with--------------

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