Metals are found in rocks, either in their unalloyed state or mixed with other metals. If there is enough metal in a rock to make it wort while to get it out, we call the rock ore, "ron ore," or "copper ore," for example. These ores are found either on the surface of the ground where
they can be obtained easily or in veins and deposits underground where they must be mined.
What does the word unalloyed mean in this paragraph?
1. pure
2. undamaged
3. equal
O 4. perfect

Aids is growing fastest in the poorest countries of africa. these nations don’t have enough doctors, medical labs, or money for medicine. a recent study showed that only a small percentage of hiv-infected children in africa are getting any medical treatment at all. what central idea is emphasized in both sources? the hiv/aids epidemic in africa is serious. the hiv/aids epidemic in south africa is serious. the hiv/aids epidemic among african children is serious. the hiv/aids epidemic among south african children is serious