Jumping out of train running at a speed of 200 kilometers per hour is quite dangerous pr

问题补充：

Jumping out of train running at a speed of 200 kilometers per hour is quite dangerous practice.

A. /; the

B. /; a

C. a; a

D. the; the

答案：

A. /; the

B. /; a

(答案→)C. a; a

D. the; the

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