As a fireman, Roll Blum knows that ______. For years Du Pont has helped firemen by ______.

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问题 As a fireman, Roll Blum knows that ______.
For years Du Pont has helped firemen by ______.

选项 A、putting out many fierce fires.
B、allowing them more time in putting out a fire
C、doing scientific research on fire wear.
D、revolting against fire authorities.

答案C

解析
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