At first it was all right because there was plenty of clean air, land and (2) .
举一反三
- Sandy derives utility from consuming 'all other goods,' g, and clean air (measured by particulate matter removed per m3), a, as measured by the utility function U(g,a) = g0.6a0.4. The price of 'all other goods' is $20 and the price of clean air (abatement) equals $10. Brian is the only other consumer in the market for clean air and demands 10 units of clean air. What is the market demand for clean air?
- The more chemical people send into the air, the less land we will possibly have because water levels will go up due to global warming.（） A: Right B: Wrong C: Not Mentioned
- Animals and plants can live on the earth because ________. A: it is the right distance from the sun B: it has plenty of water C: the sun gives them warmth and light D: all of the above
- Before the first non-stop flight made in 1949, it______necessary for all planes to land for refueling.
- . At first it seemed that the building would be all right but later it was found to need _____.