单项选择题

His contribution to the program was ______ because 99 percent of the work was completed by his colleagues.

A．invisible
B．negligible
C．appreciable
D．considerable
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单项选择题
The portion of the total income of China's railways which comes from carrying cargo is ______ 80 per cent.
A．consequently
B．roughly
C．comparatively
D．incidentally
单项选择题
Astronomers were happy to know that their ______ a bout stars in the universe were correct.
A．philosophy
B．assumptions
C．descriptions
D．consumptions
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