According to the professor, what happened in the 1990s？
A. The concept of defense mechanisms was abandoned.
B. New terms were introduced for the same mechanisms.
C. Modern researchers improved upon Freud's theory.
D. Additional categories were introduced by researchers.
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According to the author, one had better______.
A. buy more shares when the stock price falls down
B. sell out the shares when the stock price falls down
C. do some research on the value of a business when its stock price falls down
D. invest in the business when its stock price falls down
According to the professor, what can be inferred about a Renaissance man？
A. He would probably be a master craftsman.
B. He would have an aptitude for both art and science.
C. He would be interested in classical philosophers.
D. He would value logic at the expense of creativity.
动作灵活、稳定、正确、动作高度协调、连贯、多余动作消失，动觉控制占主导地位．紧张感逐渐消失等活动方式属于 ()
A. 操作定向阶段
B. 操作整合阶段
C. 操作熟练阶段
D. 操作模仿阶段
What is the discussion mainly about？
A. The discovery of the Alpha Centauri system
B. The reason solar systems are confused with galaxies
C. The vast expanse of the universe around us
D. The model at the National Air and Space Museum
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