单项选择题


A．away
B．down
C．off
D．up
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单项选择题
A．negativeB．positiveC．constructiveD．doubtful
A．negative
B．positive
C．constructive
D．doubtful
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
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