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判定研究选题的学术价值，要看该选题是否针对前人研究没有解决的问题，是否可能在前人的基础上推进学科的发展。()
The number of hospital emergency room visits by heroin users grew by more than 25 percent
A. Those who seek medical care because of heroin use usually do so in the later stages of addiction.
B. Many heroin users visit hospital emergency rooms repeatedly.
C. The number of visits to hospital emergency rooms by heroin users is proportional to the incidence of heroin usage.
D. The methods of using heroin have changed since 1980, and the new methods are less hazardous.
E. Users of heroin identify themselves as such when they come to hospital emergency rooms.
判定选题的社会价值，要看该选题是否能够解决人们在社会实践中面临的实际问题，或对社会发展做出前瞻性的预测，以满足社会的需要。()
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