Parents in the United States tend to ask their children What happened in the 1970s?

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问题 Parents in the United States tend to ask their children
What happened in the 1970s?

选项 A、The US government called on its people to reduce their weight.
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.

答案D

解析 这个问题的答案可见第三段,据一位营养学教授说,在二十世纪七十年代,餐馆每客饭菜的量开始增加,美国人的腰围也随即增大。
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