According to the passage, the following are the effects of caffeine with the EXCEPTION of
A. It can cure diseases.
B. It can change people's mood.
C. It can increase physical strength.
D. It can make people more concentrate
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假定生产某种产品的原材料价格上升，则可以断定()。
A. 若需求完全有弹性，则均衡价格不变
B. 若需求缺乏弹性，则均衡价格下降
C. 若需求完全无弹性，则均衡价格不变
D. 若需求富有弹性，则均衡价格下降
We can infer from the last paragraph that the author was ______ the capability of the World Bank to solve its problems.
A. confident in
B. indifferent to
C. optimistic about
D. pessimistic about
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.
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
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