According to the passage, which of the following statements is NOT true？
A. People are not supposed to be dependent on caffeine.
B. People need more energy because they feel more stressed.
C. People's desire for caffeinated 'energy' products is soaring.
D. People tend to drink the highest amount of caffeine that is legal.
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According to the author, the World Bank's real problem is ______.
A. its corruption
B. its policy on lending
C. its continued existence
D. Wolfowitz's romantic relationship
假设某个消费者总是把他收入的既定比例用于食品支出，则其食品需求的收入弹性()。
A. 为零
B. 无穷大
C. 为1
D. 小于1
需求法则之所以成立，是因为()。
A. 替代效应的作用
B. 收入效应的作用
C. 替代效应与收入效应的共同作用
D. 以上都不正确
若消费者对西红柿的需求产生了变化，可能是由于()。
A. 消费者得知西红柿有抗癌的功效，多食有益健康
B. 西红柿的价格大幅度下降
C. 种植西红柿的技术有了改进，致使西红柿的产量增加
D. 生产西红柿的成本降低了
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