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【单选题】
Drug use among teens concerns many people in California. Advocates of the 'Stop Drugs Now' program, which was piloted in public schools in five California counties last year, argue that the program should be used throughout the state to decrease drug use among teenagers. Which of the following statements, if true, would most strengthen the argument of the advocates of 'Stop Drugs Now' that the program should be expanded statewide?A.
School programs are far less important than parental messages in influencing a teenager's decision to use drugs.
B.
Drug use among teens in the five counties where the 'Stop Drugs Now' program was piloted has been dropping steadily for over a decade.
C.
Teenagers at the public schools where the 'Stop Drugs Now' program was piloted reported higher average levels of drug use than did teenagers at private schools in the same counties where the program was not piloted.
D.
There is evidence that teenagers who start smoking at an early age are more likely to experiment with illegal drugs than teenagers who do not smoke.
E.
The percentage of teenagers who reported using drugs at the schools where the 'Stop Drugs Now' program was piloted dropped more in the last year than in any other year over the last decade.
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举一反三
【单选题】以地表水作为水源的生活饮用水的常规处理工艺流程是( )。
A.
过滤→沉淀→混凝→消毒
B.
过滤→混凝→沉淀→消毒
C.
混凝→沉淀→过滤→消毒
D.
沉淀→过滤→混凝→消毒。
【单选题】下列选项中,哪一项是一种黑盒测试方法,它是把程序的输入域划分成若干部分,然后从每个部分中选取少数代表性数据当作测试用例?
A.
等价类划分法
B.
边界值分析法
C.
因果图法
D.
场景法
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