问题
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What will happen in future decades?A.The population of interracial Americans will be three
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What should be done in order to feed a large population?A.Inferior land must be cultivated
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According to the bond rating agency Moody, the aging population will NOT have any effect o
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If our global population becomes more carnivorous, humans will face all the following thre
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A country______birth rate is higher than its death rate will have an increasing population
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Due to the increasing aging population in China, demand()the caregivers will continu