1  2  3 

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3  _  _  _


ACROSS
1)  an antiviral drug (trade name retrovir) used in the treatment of aids; adverse side effects include liver damage and suppression of the bone marrow
2)  a prominent rock or pile of rocks on a hill
3)  a source of oil; used for forage and soil improvement and as food


DOWN
1)  a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
2)  the facility where wild animals are housed for exhibition
3)  earnest and conscientious activity intended to do or accomplish something

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