单项选择题

The survey participants were______.

A．randomly selected United States citizens
B．randomly selected New York City citizens
C．randomly selected Manhattan residents who live close to the World Trade Center
D．randomly selected American citizens who witnessed the terrorist attack

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热门试题

单项选择题

It can be inferred that______.

A．demographic information such as gender, race and marital status was not collected
B．gender and race do not have much effect on the amount of substance abuse
C．age and marital status do not make any difference on substance abuse
D．income is a better predictor of substance abuse than age

单项选择题

The survey results suggest that the largest increase in substance use was ______.

A．alcohol
B．marijuana
C．cigarettes
D．cocaine