单项选择题

The residents were asked to leave because （）

A．the firefighters were unfair
B．the fire was moving fast making it dangerous
C．the firefighters were overly careful
D．it was easier for the firefighters

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单项选择题

Why does Dr. Sterngold think that the Remco chrome-plating plant was responsible for his asthma（）

A．They never supported the hospital.
B．The plant is near the hospital.
C．Many chemicals for industry are not tested.
D．He coughed so hard that he broke his ribs.

单项选择题

What are some of the problems that Chromium Ⅵ can cause（）

A．Cancer.
B．Asthma.
C．Tumors.
D．All of the abov