单项选择题

In the 1940s ______.

A．tympanostomies were never performed.
B．tonsillectomies were done too frequently.
C．there were too few American pediatricians.
D．American children had fewer ear infections.

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热门试题

单项选择题

Tympanostomy tubes are meant to ______.

A．dissolve slowly.
B．replace medicines.
C．alleviate eardrum pressure.
D．reduce earaches.

单项选择题

The Harvard study has concluded that ______.

A．children never benefit from ear surgery.
B．tympanostomy tubes result in deafness.
C．some surgeons are too eager to operate.
D．ear tube operations are too expensive.