The reason why the toys most boys play with are different from those that girls play with
A. their social roles are rigidly determined
B. most boys would like to follow their fathers' professions
C. boys like to play with their fathers while girls with their mothers
D. they like challenging activities
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According to the passage, U. S. leadership in public relations is being threatened because________.
A. an unparalleled increase in the number of public relations companies
B. shrinking cultural differences and new communications technologies
C. the decreasing number of multinational corporations in the U. S.
D. increased efforts of other countries in public relations
Which of these do you think John Harding was？
An escaped prisoner.
B. A criminal on the run from the police.
C. An airman who had landed in an enemy country area.
D. A spy who had been hiding in the forest.
收入的增加会导致()。
A. 劣等品的需求曲线右移
B. 正常品的需求曲线右移
C. 需求没有变化，因为价格将会上升，这会抵消收入增加的效应
D. 沿需求曲线的变动
假定技术不变，且只有一种生产要素的投入量发生变化，则该种要素如果过量使用则会导致()。
A. 总产量继续增长，但增长的幅度越来越小
B. 总产量下降，但不会等于零
C. 最终使总产量下降
D. 边际产量减少直到等于零
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