The two energy sources that cause the most air pollution in the Middle East are "?" A. coal and gas
B. nuclear power and oil
C. coal and nuclear power
D. gas and oil

If you were a casual recreational hiker with young children, which of the following trails would be least strenuous for a leisurely family outing? a. merced lake trail b. mirror lake loop trail. c. tenaya lake and tuolumne meadows trail d. el capitan trail