国家对已成立的合同的不同态度，可将合同的效力分为哪几类？
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Which of the following is NOT true according to Paragraph 2？
A. Teaching ability is the most important factor in teachers" promotion.
B. Other subjects have the same problems with economics.
C. Morden universities pay more attention to research than teaching.
D. Many teachers regard teaching as an obstacle in their work.
It is advantageous to look youthful because______.
A. other members of society rarely attack younger looking members
B. young people eat less
C. older members of society do not usually consider younger people to be threats
D. humans have a natural instinct to take care of younger members of society
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