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Questions 4--6 Answer the following questions by using NO MORE THAN three words.
What kind of effect do chemicals in cannabis produce

【参考答案】

Synergistic effect
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A
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Cannabis ______. A. is praised for its potential for treating pain and cancer by scientists B. is considered a dangerous drug without any medical use by many governments C. is now used to treat cancer in the USA D. has been used in medicine for thousands of years
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