The author suggests that our ability to sense a threat and desire to flee ______.
A. are connected with types of shyness
B. make us more timid and less successful
C. distinguish humans from other creatures
D. are the results of the influence of our environment
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“动机水平适中最有利于激发活动动机’’的理论是（）。
A. 成就动机理论
B. 耶克斯一多德森定律
C. 成绩结构理论
D. 强化理论
It is shown that the most common mental disorder in the U. S. is ______.
A. depression
B. alcoholism
C. social phobia
D. panic disorder
A．elsewhereB．anywhereC．somewhereD．nowhere
A. elsewhere
B. anywhere
C. somewhere
D. nowhere
What does David Shenk worry about？
A. The capacity of the gene pool.
B. The nurture of subsequent generations.
C. The dramatic increase of world population.
D. The consequences of excessive genetic shifts.
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