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

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热门试题

单项选择题

Which is the proper explanation of the word fade'(L. 2, para. 3 )

A．Disappear.
B．Decrease.
C．Demonstrate.
D．Declare.

单项选择题

What does the sentence A bird learns to sing and to fly rapidly at the right time... (Para. 3) mean

A．A bird learns to sing and fly after twelve weeks.
B．A bird learns to sing and fly when it is old enough.
C．An infant learns to smile and make vowel-like sounds at twelve weeks.
D．A bird learns to sing and fly fast at a certain stage.