单项选择题
We have arranged to go to the cinema on Friday, but we can be ______ and go another day.
A.reliable
B.probable
C.feasible
D.flexible
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单项选择题
Lung cancer, like some other cancers, often doesn t produce ______ until it is too late and has spread beyond the chest to the brain, liver or bones.
A.trails
B.therapies
C.symptoms
D.symbols
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单项选择题
The defense lawyer was questioning the old man who was one of the ______ of the murder committed last month.
A.observers
B.witnesses
C.audiences
D.viewers
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