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    good, these cookies sell well. A. Smelled B. Smelling C. Being smelled D. To smell III. 完形填空: Many of the world's pollution problems have been 1 by the crowding of large groups of people into cities．Supply for the 2 of the people leads to 3 pollution by industry．If the 4 increase in human population 5 at the present rate.there may be much greater harm． Some scientists speak of the 6 in number of people as“population pollution． About 2000 years ago.the world 7 was probably about 250 million． 8 reached a billion in 1850．By 1930the population was two billion．It is 9 six and a half billion．It is 10 to double by the year 2050．If the population continues to grow at the same 11 . there would be 25 billion people in the world a hundred years from now． Man has been using the earth's 12 more and more rapidly over the years．Some of them are almost 13 ．Now many people believe that man's greatest 14 is how to control the growth of his population．The 15 in the world will not support the human population.in time to come.if the 16 rate of increase continues． 17 there is over crowding in the 18 and hunger in some countries． Can man's rate of increase 19 ?Many people believe that human survivalin the future depends on the answer 20 the question． 【查看更多】

     

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    _____ good, these cookies sell well.

    A.Smelled    B. Smelling  C. Being smelled D. To smell

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    _____ good, these cookies sell well.

    A.Smelled    B. Smelling  C. Being smelled D. To smell

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    ._____ good, these cookies sell well.

    A. Smelled    B. Smelling  C. Being smelled D. To smell

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    _____ good, these cookies sell well.

    A.Smelled    B. Smelling  C. Being smelled D. To smell

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    _____ good, these cookies sell well.

    A.Smelled    B. Smelling  C. Being smelled D. To smell

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