B. is infinitely more complex and powerful than any known computer.
C. reaches its maximum efficiency at the age of three
D. is not as complicated and mysterious as has usually been taught.
5. It is explained in the passage that the efficiency of the computer ……..
A. will soon make it possible for the man to be served by robots
B. depends on the speed with which the data are fed
C. can best be appreciated in the decision-making positions
D. is the result of its being concentrated on one task at a time
6. The author feels that the computers ……..
A. are becoming unaffordable as they get more advanced
B. have contributed immensely to the improvement of living standards
C. have been unnecessarily overrated
D. will be a major force behind all future progress
The dramatic growth of world's population in the twentieth
century has been on a scale without parallel in human society. Most of this growth has occurred since 1950 and is known as "population explosion". Between 1950 and 1980 the world population increased from 2.5 to over 4 billion and by the end of the century, this figure will have risen to at least 6 billion. Growth of this size cannot continue indefinitely. Recent forecasts suggest that the total population will level out at between 10 and 15 billion in the mid twenty-first century. Already there are encouraging signs that the rate of increase in many less developed countries is beginning to slow down.
7. According to the passage, at no period in Human history has there been
A. so much consensus among nations concerning the population of the world.
B. a sharp decline in population like the one since 1980.
C. a universal fear about the future of man 144
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
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