单项选择题

A．fatal
B．lethal
C．mortal
D．morale
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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.
单项选择题
How many engines did the jetliner have originally
A．2
B．1
C．3
D．4
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