单项选择题

A．every
B．each
C．all
D．separately
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单项选择题
A．fatalB．lethalC．mortalD．morale
A．fatal
B．lethal
C．mortal
D．morale
单项选择题
What do scientists learn about human brain according to the passage
A．It is very easy to understand how memory works.
B．Memory has a very limited capacity to store information.
C．Information stored in the human brain is never lost.
D．Very old people seldom remember their childhood.
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