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 tone of the passage can best be described as __________________.
A．hypothetical
B．humorous
C．exaggerative
D．philosophical
单项选择题
From the evolutionary point of view, _______________.
A．forgetting for lack of practice tends to be obviously inadaptive
B．if a person gets very forgetful all of a sudden he must be very adaptive
C．the gradual process of forgetting is an indication of an individual's adaptability
D．sudden forgetting may bring about adaptive consequences
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