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  3. People are making more and more demands for the world’s natural resources. If babies born in 1991 live for 80 years, the human p

People are making more and more demands for the world’s natural resources. If babies born in 1991 live for 80 years, the human p

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问题     People are making more and more demands for the world’s natural resources. If babies born in 1991 live for 80 years, the human population of the world may be anything from twice to three times the present total by 2070. In other words, they will have to share what is left of the earth’s resources with between 10 and 15 billion other people. But hopefully there will be a significant decrease in the growth of population. What if this does not happen? The answer is that before the babies born in 1991 reach the age of 40 they will have been sharing resources with as many as 10 billion other people.
    Limiting the pollution of water and the atmosphere, controlling the output of the chemicals that may be causing global warming, and eating less meat may go some way to help, but can anyone seriously imagine that these are going to solve the problems of the "baby class" of 1991?
    There is no getting away from the fact that people are responsible for the present state of the world, and only people can solve the problems. The decisions have to be taken by people as members of national and local governments; as leaders and decision-makers in industry; as scientists and technologists; as professional engineers and designers; as religious leaders and as individual citizens.
It is implied in the second paragraph that________.
选项 A、limiting pollution is of great importance
B、not all the people know how to save our planet
C、our planet is becoming warmer because of pollution
D、we should eat less so that more people can be fed
答案B
解析 根据第二段内容可知，限制水污染和大气污染、控制可能导致全球变暖的化学制品产量以及少吃肉可能会在一定程度上有帮助，但任何人都能认真地认为这些会解决1991年的“婴儿群体”所面临的问题吗?由此可推知，并不是所有人都知道如何拯救地球，所以B项符合题意。A、C、D三项与文章内容不符，这三项均不符合题意。故选B。
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