单项选择题

A. They are scientific. B. They are too complicated.
C. They should be banned. D. They are not truthful, but effective.
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单项选择题
What can we learn from the first paragraph about the critical period
A. It is a point at which the process of learning ends.
B. It is a phase which is crucial to the acquisition of a certain ability.
C. It is a phase after which we do not need to acquire a certain ability.
D. Mans and animals have a similar critical period for a certain ability.
单项选择题
A. Run in town. B. Look more carefully. C. Buy shoes from a catalog. D. Find an easier place to exercise.
A. Run in town. B. Look more carefully.
C. Buy shoes from a catalog. D. Find an easier place to exercise.
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