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
Events enter the long-term memory if ______.
A．we think about them repeatedly
B．we are determined to remember them
C．they are experimented many times
D．they happen unexpectedly
单项选择题
What are the usual results of the bypass operation
A．The patient is relieved of pain.
B．The patient's arterial condition is permanently cured.
C．The patient has a 50% chance of being incapacitated again within a year.
D．The patient is not likely to have trouble in his other arteries if he has one artery bypass by surgery.
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