单选题
The energy crisis, which is being felt around the world, has dramatized how the careless use of the earth's resources has brought the whole world to the brink of disaster. The overdevelopment of motor transport, with its【C1】______of more cars, more highways, more pollution, more suburbs, more commuting, has【C2】______to the near-destruction of our cities, and the pollution not only of【C3】______air, but also of the earth's atmosphere. The disaster has arrived in the【C4】______of the energy crisis. Our present【C5】______is unlike war, revolution or depression. It is also unlike the great natural disasters of the past. Worldwide resources【C6】______and energy use have brought us to a state【C7】______long-range planning is essential. What we need is not a continuation of our present serious state, which【C8】______the future of our country, our children, and our earth.【C9】______a movement forward to a new norm in order to work rapidly and effectively on planetary problems. This country has been falling back under the continuing exposures of loss of【C10】______. There is a strong demand for moral revival and【C11】______some devotion that is vast enough and yet【C12】______enough to enlist the devotion of all. In the past it has been only in a way in【C13】______of their own country【C14】______any people have been able to【C15】______themselves wholeheartedly. This is the first time we have been asked to defend ourselves and what we hold dear in【C16】______with all the other inhabitants of this planet, who【C17】______with us the same endangered air and the same endangered oceans. There is a【C18】______need to reassess our present course, and to【C19】______new methods through which the world can survive. This is priceless【C20】______.