The examples of Clare and John are given in order to illustrate that______.
A. families with too many kids tend to be unhappy
B. children can be a major source of unhappiness and trouble
C. sharing holidays are not always pleasant
D. you need less money to have a sharing holiday with your friends
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It was amazing that the boy was able to solve the problem so quickly.
A. frustrating
B. confusing
C. reasonable
D. surprising
Which of the following words is closest in meaning to the word "tiring" (Para. 2) ？
A. Interesting.
B. Exhausting.
C. Tired.
D. Boring.
假设规模收益递增，单位时间内同时增加了10％的劳动和资本投入量，产量将()。
A. 增加10％
B. 减少10％
C. 增加大于10％
D. 增加小于10％
下列因素除哪一种以外都会使需求曲线移动？()
A. 购买者(消费者)收入变化
B. 商品价格下降
C. 其他有关商品价格下降
D. 消费者偏好变化
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