对地西泮催眠作用特点描述正确的有

A．耐受性和成瘾性的发生率极低

B．对睡眠持续无影响

C．延长快动眼睡眠时间

D．停药后代偿反跳较轻

E．缩短睡眠诱导时间

In the United States in 1986, the average rate of violent crime in states with strict gun-control laws was 645 crimes per 100,000 persons—about 50 percent higher than the average rate in the eleven states where strict gun-control laws have never been passed. Thus one way to reduce violent crime is to repeal strict gun control laws.
Which of the following, if true, would most weaken the argument above

A．The annual rate of violent crime in states with strict guncontrol laws has decreased since the passage of those laws.

B．In states with strict gun-control laws, few individuals are prosecuted for violating such laws.

C．In states without strict gun-control laws, many individuals have had no formal training in the use of firearms.

D．The annual rate of nonviolent crime is lower in states with strict gun-control laws than in states without such laws.

E．(E) Less than half of the individuals who reside in states without strict gun-control laws own a gun.