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A Methadone is an effective way to treat a hard heroin addict.
B Methadone is not a correct way to treat a heroin addict.
C Hospitalization together with methadone can work effectively with a heroin addict.
D Methadone and heroin are equally effective in treating a heroin addict

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A strong measures have been taken by the government to prevent global warming.
B to reduce carbon emissions is all impossible mission.
C despite the difficulty，scientists have some options to prevent global warming.
D actions suggested by scientists will never be realized

Scientists resist talking about their options because they don't want people to
A know what they are doing.
B feel their efforts are useless.
C think the problem has been solved.
D see the real problem.

当代大学生创业的阻碍因素在哪里？应该从哪些方面去解决

。经过调查发现老人的死跟这位保姆有直接关系，而更离奇的是，除此一单命案，这位保姆从2013年6月到2014年12月做保姆期间谋害了9名老人，其中7人死亡。对此，你怎么看？