单项选择题

To help keep prices from going higher, people and groups in California ______.

A．imposed reasonable price caps
B．beat down the door of federal regulators
C．urged the federal authorities to take action
D．struggled against federal policy to hike prices
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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
单项选择题
In his research, Gerald Wilde finds that technological advances and increases in safety standards ______.
A．have helped solve the problem of so high death rate
B．have oddly accounted for mortality rates in the past century
C．have reduced mortality rates for violent and accidental deaths,
D．have achieved no effect in bringing down the number of deaths
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