单项选择题

Medical researches ______ much of the rise in the incidence of lung cancer to the widespread use of cigarettes.

A．subscribe
B．ascribe
C．prescribe
D．acknowledge
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单项选择题
Techniques such as object-oriented design and structured programming will have to be followed to ______ to engineering practice.
A．conform
B．appeal
C．refer
D．tumble
单项选择题
The campers had no way to measure the exact distance they had walked, but they thought it was ______ 3 miles.
A．apparently
B．appropriately
C．approximately
D．statistically
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