【单选题】Cars account for half the oil consumed in the U. S. , about half the urban pollution and one fourth the greenhouse (温室) gases. They take a similar oil of ullage (损耗) resources in other industrial nati...
A.
consume half of the oil produced in the world
B.
have serious consequences for the well-being of all nations
C.
widen the gap between the developed and developing countries
D.
impose an intolerable economic burden on residents of large cities