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Q31: Industrial smog used to be a serious
Q43: It has been estimated that up to
Q48: Granite is a type of _ rock.
Q56: It can be said that, of the
Q58: Which of the following is a secondary
Q83: AIDS has reduced the life expectancy of
Q92: _is (are) a key nutrient that drives
Q94: _ have estimated that up to 25%
Q94: When farmers use _systems, typically 90-95% of
Q110: Which of the following is not an