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  3. By the twenty-first century, more people will be descendants of the non-Western groups that anthropologists have traditionally

By the twenty-first century, more people will be descendants of the non-Western groups that anthropologists have traditionally

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问题     By the twenty-first century, more people will be
descendants of the non-Western groups that
anthropologists have traditionally studied. It’s easy to
see that solutions for future problems will depend 【M1】______
increasingly on understanding non-Western cultural
background. The Southern Hemisphere is steadily
increasing their share of world population, and the 【M2】______
fastest population growth rates are in Third World cities.
Rural migrants move to slums, where they live in
hovels that lack utilities and public sanitation facilities.
Growing with 12 to 20 percent each year, the world 【M3】______
slum population will double in three to six years. If
current demographic trends continue, urban population
increase and the concentration of city dwellers in slums
will be accompanied by increased rates of crime and 【M4】______
water, air, and noise pollution. These problems will be
most severe in the less-developed countries. Therefore, 【M5】______
they will also affect the United States, which shares a
front with Mexico, one of the world’s fastest growing 【M6】______
nations.
    As a result of petroleum — and chemical — dependent
mechanized farming, the global food supply increased
dramatically from the 1950s through the mid-1980s.
Now, moreover, food production and food distribution 【M7】______
are not keeping up with world population growth. The
gap will surely widen up if current trends continue. 【M8】______
Children will go on dying as starvation substitutes for
more human means of limiting population growth. 【M9】______
Today’s African famine areas provide a glimpse of
things to come. From the global perspective, birth
control and family planning are essential if resources
are to be sufficient, if starvation, pestilence, and war are 【M10】______
not to stalk the earth during the third millennia.
【M5】
选项
答案Therefore—However
解析 语篇错误。上一句说的是“这些问题会对不发达国家影响最为严重”，本句则说“它们对美国也有所影响”，显然这两句间不会是因果关系，而只能是意思上的转折，因此however更加合适。
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