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 above.

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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

One of the important issues in the story is （）

A．the dangers of emergency rooms
B．doctors prescribing too many drugs
C．the battle to balance public health and a healthy economy
D．why scientists restricted asbestos