单项选择题

Direction: There are five reading passages in this part. Each passage is followed by four questions. For each question there are four suggested answers marked A,B,C and D. Choose the best answer and blacken the corresponding letter on the Answer Sheet.
Passage One

Young people who drink or use drugs are mainly influenced by both their parents and peer pressure. Other reasons they take that first drink are to be rebellious(反抗的), for curiosity or "kicks" (刺激)or to escape an unpleasant environment; And young people drink use drugs because alcohol(酒精) and drugs are at hand. After first experimental use, young people continue to drink or use drugs because they believe these substances can relieve boredom, increase energy, decrease anxiety, solve problems, or help them socially. They may simply like the "high" they get in the early and middle stages of substance use. After continued use, they will become physically and psychologically(心理地)addicted(上瘾的). Now that we have admitted that we have to solve this problem, we must decide how to deal with this challenge. Winning this will take a great effort involving local, state, and national government. It will require the effort of schools, but it cannot be clone by schools alone. It will also require family and community involvement. Already a great amount of time, energy and expert knowledge has been directed toward dealing with it but the problem continues.

Which of the following is not mentioned as the reason of young pedple’s drinking and usingdrugs in the passage