单项选择题
Tympanostomy tubes are meant to ______.
A．dissolve slowly.
B．replace medicines.
C．alleviate eardrum pressure.
D．reduce earaches.
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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.
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单项选择题
In addition to the economic considerations, there is a ________ motive behind Bush's signing of the new farm bill.
A．partisan
B．social
C．financial
D．cultural
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