单项选择题

This survey was conducted to find out how many people prefer butter.

A. examination
B. inspection
C. analysis
D. investigation
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单项选择题
What influenced you to do it
A. affirmed
B. affected
C. invited
D. interested
单项选择题
Be suspicious about water from other sources, such as ponds, streams, wells, tanks, water trucks or public standpipes.
A. brave
B. doubtful
C. quiet
D. careful
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