Paragraph 1What the author does:Presents research claims about the harmful effects of marijuana and questions whether marijuana is the actual cause of these problems.
Brief summary:Studies link heavy marijuana use to physical, psychological, and social problems, but it is unclear whether marijuana causes them directly.
Paragraph 2What the author does:Explains the argument that marijuana can be addictive by presenting an expert's opinion.
Brief summary:Although marijuana does not have a strong withdrawal syndrome, some experts believe it can still cause dependence.
Paragraph 3What the author does:Evaluates scientific evidence about marijuana's medical use and discusses its limitations.
Brief summary:Research on medical marijuana has produced mixed results, and its side effects may make it less useful than other treatments, although further studies continue.
1. According to the passage, all of the following are harmful effects of marijuana EXCEPT:A. poor performance at work
Wrong: The passage mentions that heavy marijuana users may perform poorly at work or school.
B. development of psychiatric problems
Wrong: The passage explicitly states that heavy users are more likely to develop psychiatric problems.
C. growth of toe fungus and thrush
Wrong: The passage mentions studies linking marijuana use to toe fungus and thrush.
D. depression and memory loss
Correct: The passage does not mention depression or memory loss as effects of marijuana.
E. abnormal brain waves
Wrong: The passage states that heavy users may have abnormal brain waves.
2. According to an earlier definition, why is marijuana not considered addictive?A. Its use does not result in death
Wrong: The passage does not mention death as a criterion for addiction.
B. Lack of clearly defined withdrawal syndrome
Correct: The passage explains that marijuana was not traditionally considered addictive because it does not produce a clearly defined withdrawal syndrome.
C. It has several beneficial uses
Wrong: The passage does not link addiction definition to beneficial uses.
D. Its harmful effects have not been proved
Wrong: The issue discussed is addiction criteria, not proof of harm.
E. Its use is legal in a lot of countries
Wrong: Legality is not mentioned as a reason in the passage.
3. Which of the following can be inferred from the information in the passage?A. It has now been proved without a doubt that marijuana is indeed harmful to humans
Wrong: The passage does not state that marijuana's harmful effects have been proven beyond doubt. It actually raises questions about whether marijuana causes the problems or whether people with existing problems are more likely to use it.
B. Marijuana has been unreasonably criticized by doctors
Wrong: The passage does not suggest that doctors have criticized marijuana unfairly. It only presents research findings and discusses the debate surrounding them.
C. Netherland will soon make marijuana illegal
Wrong: The passage never mentions the Netherlands or any plans to make marijuana illegal.
D. Marijuana has several harmful effects and probably some beneficial ones as well
Correct: The passage discusses possible harmful effects of marijuana and also mentions research into its medical uses. This suggests that marijuana may have both harmful and beneficial effects.
E. The US Drug Enforcement Agency has decided to ban the use of marijuana
Wrong: The passage states that the U.S. Drug Enforcement Agency agreed to provide funds for further research on marijuana's medical effectiveness, not to ban it.