单项选择题

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单项选择题
What does Jack Frost city mean
A. A city full of frosts.
B. A very busy city.
C. A city that is always very cold.
D. A city that is often covered by snow.
单项选择题
The American Statistical Association ______.
A. is converting statistical study from an art to a science

B. has an excellent record in business forecasting

C. is neither hopeful nor pessimistic

D. speaks with mathematical exactitude
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