单项选择题

There is no risk to public health.

A. point
B. danger
C. chance
D. hope
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单项选择题
A. reason B. effect C. role D. origin
A. reason
B. effect
C. role
D. origin
单项选择题
A. puzzles B. problems C. freedom D. shortages
A. puzzles
B. problems
C. freedom
D. shortages
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