D. a population explosion of the magnitude of the one in this century 8. It is pointed out in the passage that the increase in the world population
A. is a highly encouraging sign for the general economy
B. is expected to continue even faster until 2050
C. will not continue into the next century
D. has been going on noticeably since 1950 9. It has been forecast that, by the middle of the next century
A. various measures will have been taken to encourage population growth
B. the population growth rate in less developed countries will be much higher than that in
previous years
C. the world population will be stabilized at around 10 to 15 billion D. the rate of increase will still be rising
Many substances, whether man-made or natural, can cause harm to man or the environment.
Some of these reach the environment in waste streams; however, emission limits and
environmental quality standards can, in some instances, reduce the amounts released. But some
other substances cannot be controlled in this way because they are released, not in industrial
waste streams, but through the use of disposal of products which contain them. In many cases
these substances pose little or no threat if the product containing them is used and disposed
properly. The right way to deal with them is usually through controls over their supply, use and
disposal.
10. According to the passage, the threat of certain substances to the environment ....... .
A. is far less than that to man.
B. could be reduced by enforcing emission limits and environmental controls C. has been unnecessarily emphasized
D. has to date been completely ignored
11. The author points out that the danger posed to man by many substances .....
A. is unrelated to environmental pollution
B. is even greater than generally admitted
C. continues to grow despite constant control of disposal systems
