单项选择题

According to the text, if a person never forgot ______.

A．his ability to learn would be improved
B．he would survive best
C．he would have a lot of trouble
D．the evolution of memory would stop
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单项选择题
From the last paragraph we know that ______.
A．forgetfulness is a response to learning
B．memory is a compensation for forgetting
C．the memory storage system is an exactly balanced input-output system
D．the capacity of a memory storage system is limited because forgetting occurs
单项选择题
The reason some children are backward in speaking is that ______.
A．they are unable to learn language rapidly
B．their mothers are not clever about a child
C．their mothers respond inadequately to their attempts to speak
D．they are exposed to too much language at once
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