单项选择题

A．A city guide.
B．A librarian.
C．A computer expert.
D．A registrar.
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单项选择题
A．A person who is awake early.B．A bird that catches the worm early in the morning.C．A plane which flies in the morning.D．A communications satellite in orbit round the earth.
A．A person who is awake early.
B．A bird that catches the worm early in the morning.
C．A plane which flies in the morning.
D．A communications satellite in orbit round the earth.
单项选择题
In math, simplicity means that a detailed proof tends to be a better one.
A．Y
B．N
C．NG
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