单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．Smoking
B．Obesity in young adults
C．Drinking
D．Obesity in elderly adults
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单项选择题
A．The bacteria would be killed by the human immune system.B．The bacteria would die if brought to the surface.C．Many antidotes and remedies are available.D．Drilling operations are always closely monitored.
A．The bacteria would be killed by the human immune system.
B．The bacteria would die if brought to the surface.
C．Many antidotes and remedies are available.
D．Drilling operations are always closely monitored.
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