单项选择题

The battle between Californians and federal regulators is about ______.

A．control over the price of power
B．necessity of removing price caps
C．hiking the energy prices in California
D．a regulation concerning power supply
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单项选择题
By saying ...statistically canceling out the benefits that the seat belt confers (Para. 2), the author means ______.
A．wearing seat belts does not have any benefits from the statistic point of view
B．deaths from wearing seat belts are the same as those from not wearing them
C．deaths from other reasons counterbalance the benefits of wearing seat belts
D．wearing seat belts does not necessarily reduce deaths from traffic accidents
单项选择题
What social scientists have long felt puzzled about is why ______.
A．the mortality rate can not be predicted
B．the death toll remained stable year after year
C．a quota for each type of death has not come into being
D．people lost their lives every year for this or that reason
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