行为强化的理论与实验研究表明，对于初学某个运动技能或刚刚参加体育活动的参与者，在表现出正确行为后，立即
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Why do some people move back to cities？
A. Because they want to be closer to a city life.
Because they can save time driving to work.
C. Because they can save the cost of driving long distances to work.
D. Because they think it"s more convenient to live near the workplace.
What are two key factors of force description？ [Clink on 2 answers. ]
A. Magnitude.
B. Weight.
C. Direction.
D. Power.
体育教师可从学生在运动学习和身体锻炼中的行为表现上观察和推测出他们的体育学习动机。
The word erred in Paragraph 6 is closest in meaning to______.
A. estimated
B. changed
C. misjudged
D. failed
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