单项选择题

What does the word "well-trodden" (Sentence 7, Para. 2) mean

A．Repeatedly "walked upon".
B．Well-thought.
C．Well-performed.
D．Carefully prepared.
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单项选择题
What is a coronary bypass
A．An operation to bypass the heart.
B．An operation to replace a disabled artery with another artery.
C．An operation to construct a passage around a blocked artery.
D．An operation to take care of faulty heart action.
单项选择题
Under what conditions should the bypass operation be performed
A．When a general practitioner is available to perform it.
B．When there is room in the hospital emergency ward for the patient.
C．When the patient can be expected to show favorable results.
D．When the doctor recommends against it.
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