单项选择题


A．people
B．man
C．scientists
D．the man
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单项选择题
A．inventingB．improvingC．findingD．discovering
A．inventing
B．improving
C．finding
D．discovering
单项选择题
A．rarely worthlessB．nearly uselessC．almost of no useD．rarely invaluable
A．rarely worthless
B．nearly useless
C．almost of no use
D．rarely invaluable
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