3
in numbers of people as “population pollution”. 人口与环境 A. needs B. continues A. increase
About 2,000 years ago, the world population was
4
about 250 million. It
5
a billion in 1850. By 1930 the population was two billion. It is now six billion. It is
6
to double by the year 2020. If the population continues to grow at the same
7
, there will be 25 billion people in the world a hundred years from now. D. probably D. reached C. expected A. rate
Man has been using the earth’s
8
more and more rapidly over the past years. Some of them are almost
9
. Now many people believe that man’s greatest
10
is how to control the growth of the population.
C. problem C. gone A. resources The
11
supplies in the world will be far from enough to
12
the human population if the 13
rate of increase continues. There is already over-crowding in many
14
and starvation in some countries. Many people believe that human
15
in the future depends on the answer to the question. D. material D. support B. cities D. survival A. present
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