单项选择题

Your dog needs at least 20 minutes of vigorous exercise every day．

A．physical
B．energetic
C．regular
D．free
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单项选择题
The policeman wrote down all the particulars of the accident.
A. secrets
B. details
C. benefits
D. words
单项选择题
Many forms of cancer can be cured if detected early（）

A. selected
B. operated
C. developed
D. discovered
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