Methadone is now being used as an analgesic, as well as a maintenance drug for heroin withdrawal.
Answer:
1. E
2.E
3.True
4.True
Explanation:
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HIV crossed from chimps to humans in the 1920's in what is now the Democratic Republic of Congo. This was probably as a result of chimps carrying the Simian Immunodeficiency Virus (SIV), a virus closely related to HIV, being hunted and eaten by people living in the area.
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