单项选择题

For years Du Pont has helped firemen by ______.

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.

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热门试题

单项选择题

As a fireman, Roll Blum knows that ______.

A．fire can kill anyone very quickly.
B．fire does not kill easily.
C．fire always kills.
D．fire is impossible to fight.

单项选择题

This passage is probably taken from ______.

A．a story.
B．a science report.
C．a book review.
D．an advertisement.