单项选择题

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

A．he would survive best
B．he would have a lot of trouble
C．his ability to learn would be enhanced
D．the evolution of memory would stop
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单项选择题
The author's main purpose in writing this passage is to ______.
A．interpret the function of forgetting
B．illustrate the process of adapting
C．explain the performance of memory
D．emphasize the importance of learning
单项选择题
From the last paragraph we know that ______.
A．forgetfulness is a response to learning
B．the memory storage system is an exactly balanced input--output system
C．memory is a compensation for forgetting
D．the Capacity of a memory storage system is limited because forgetting occurs
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