单项选择题


A．negative
B．positive
C．constructive
D．doubtful
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单项选择题
The space shuttle Discovery completed a ______ mission upon its return to Kennedy Space Centre.
A．11-day
B．94-day
C．10-day
D．49-day
单项选择题
When the spacecraft was going to land,______.
A．it produced a lot of noise
B．there were scattered showers
C．people could see it high in the sky
D．people could neither see nor hear it
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