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When you read the sentence, the population
of the earth has grown by10 people. That may not sound much, {#blank#}1{#/blank#} it's about 14, 000 people per hour. Most of
these new people are born in {#blank#}2{#/blank#} (develop) countries. These countries are found
in much of Africa, South America and parts of Asia.
In the developed countries of Europe and
North America, the population is growing very {#blank#}3{#/blank#}(slow). This is {#blank#}4{#/blank#} women in these countries have, on average(平均), only one or two children. But in the developing countries, many
women have five {#blank#}5{#/blank#} more children. In the developing countries, more
than one billion people already live below the poverty level(贫困线). These people don't have enough food {#blank#}6{#/blank#} (eat) and they live in poor housing. Children
get little or no time at school and suffer from many {#blank#}7{#/blank#} (kind) of diseases.
The UN has said that the world's population
will reach over 10 {#blank#}8{#/blank#} (billion) by the year 2100.If the number {#blank#}9{#/blank#} (make) your head spin(眩晕), you're not alone. Many experts(专家) are
worrying that so fast population {#blank#}10{#/blank#} (grow) could have very bad results. It could
hurt the environment and increase the number of poor people.
