单项选择题

(Leading) scientists are often the (kinds of person) who (have enjoyed) intellectual challenges (all their lives).

A．Leading
B．kinds of person
C．have enjoyed
D．all their lives
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单项选择题
Not only (we lost) all our (memory), but we (also) came close to (losing) our lives.
A．we lost
B．memory
C．also
D．losing
单项选择题
(Fighting) broke (out) (between) the Northern (states) and Southern states.
A．Fighting
B．out
C．between
D．states
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