单项选择题

A．He is smoking..
B．He is my boss.
C．He is over there.
D．He is kin
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单项选择题
A multi-stage rocket refers to ______ .
A．several rockets which are separated from each other
B．a single rocket with enough fuel
C．the booster which is the biggest and can lift the whole rocket from the ground
D．a rocket with several parts, and each of which can help to push the spaceship into the space
单项选择题
A．A teacher.B．A lawyer.C．A doctor.D．A worker.
A．A teacher.
B．A lawyer.
C．A doctor.
D．A worker.
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