单项选择题

The researcher mentioned in the third paragraph was fired because______.

A．she worked for the rival of the company
B．she failed to keep her research results secret
C．she was obliged to keep her discoveries secret
D．she was committed to a contract with a company
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单项选择题
It can be inferred from the passage that doctors are able to determine hospital policies because______.
A．it is doctors who generate income for the hospital
B．a doctor is ultimately responsible for a patient's health
C．most of the patient's bills are paid by his health insurance
D．some patients might refuse to accept their physician's advice
单项选择题
According to the author, when a doctor tells a patient to return next Wednesday , the doctor is in effect______.
A．advising the patient to seek a second opinion
B．admitting that the initial visit was ineffective
C．instructing the patient to buy more medical services
D．warning the patient that a hospital stay might be necessary
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