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

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热门试题

单项选择题

What happened to people who lived in Willits from 1964～19957（）

A．They all got sick.
B．They are at higher risk of cancer and asthma.
C．They lost their jobs at the plant.
D．Most of them moved away.

单项选择题

How much Chromium Ⅵ is a safe amount（）

A．No safe level.
B．6 %.
C．It is safe.
D．No one knows.