[单项选择]Of greatest interest to those concerned with the environmental aspects of solid waste management is the issue of—and the need for—resource recovery and recycling. To many Americans, there is perhaps no greater symbol of our imbalance with nature and our mal-adaptation to its realities than the fact that we discard millions of tons of wastes every year which do, in act, have value. The American people realize now that trash need not be mere junk. It has the potential of becoming a significant vein or resources, a mother lode of opportunity for men of vision who can see beyond the horizon.
The American people are right. And those who serve them can no longer view solid waste management solely in terms of collection and disposal. However, something more than the magic of science and technology is required to convert all this waste back into useful resources.
In fact, in proportion to consumption, resource: recovery has been steadily losing ground in recent years in virtually eve
A. requires further research
B. is available now
C. remains to be developed
D. is still being experimented

[单项选择]Of greatest interest to those concerned with the environmental aspects of solid waste management is the issue of—and the need for—resource recovery and recycling. To many Americans, there is perhaps no greater symbol of our imbalance with nature and our mal-adaptation to its realities than the fact that we discard millions of tons of wastes every year which do, in act, have value. The American people realize now that trash need not be mere junk. It has the potential of becoming a significant vein or resources, a mother lode of opportunity for men of vision who can see beyond the horizon.
The American people are right. And those who serve them can no longer view solid waste management solely in terms of collection and disposal. However, something more than the magic of science and technology is required to convert all this waste back into useful resources.
In fact, in proportion to consumption, resource: recovery has been steadily losing ground in recent years in virtually eve
A. Production costs do not include the true costs of environmental impact.
B. There axe subsidies to virgin materials.
C. Using virgin materials can protect environment.
D. The secondary materials are more expensiv

[单项选择]

One of the greatest problems for those settlers in Nebraska in the last quarter of the previous century was fuel. Little of the state was forested when the first settlers arrived and it is probable that by 1880. only about one - third of the originally forested area remained down to a mere I per cent of the state’s 77 000 square miles. With wood and coal out of the question, and with fuel needed year-round for cooking, and during the harsh winter months for heating, some solution had to he found.
Somewhat improbably, the buffalo provided the answer. Buffalo chips were found to burn evenly, hotly, and cleanly, with little smoke and, interestingly, no odor. Soon, collecting them became a way of life for the settlers’ children who would pick them up on their way to and from school, or, take part in competitions designed to counteract their natural reluctance. . Even a young man, seeking to impress the girl he wanted to marry, would arrive with a large bag of chip
A. The solution to the Nebraskan settlers’ fuel problem.
B. Life in Nebraska in the late nineteenth century.
C. The importance of the American buffalo.
D. The forestation in Nebraska in the late nineteenth century.