单项选择题

Questions 11-13 are based on the passage you have just heard. In what way can aspirin help heart surgery patients according to the doctors

A．It keeps blood vessels from being blocked.
B．It speeds up their recovery after surgery.
C．It increases the blood flow to the heart.
D．It adjusts their blood pressure.
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单项选择题
Why do the “little thieves” steal
A．They want some excitement.
B．They want the things they can’t afford.
C．They want to earn money in this way.
D．They do it for a living.
单项选择题
According to the theory of risk homeostasis , some traffic accidents result from______
A．our innate desire for risk
B．our fast and reckless driving
C．our ignorance of seat belt benefits
D．our instinctive interest in speeding
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