单项选择题

The ______ of lung cancer is particularly high among long-term heavy smokers, especially chain smokers.

A．incident
B．accident
C．incidence
D．evidence
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单项选择题
His effort of decades began to ______ He came to be well-known for his findings.
A．pay off
B．die off
C．put off
D．break off
单项选择题
This great project at the Three Gorges of the Yangtze is expected to ______ twenty years to complete.
A．spend
B．consume
C．need
D．take
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