2. 外语
  3. The link between health and income seems pretty uncontroversial.【C1】______all, healthy people can work longer and harder than si

The link between health and income seems pretty uncontroversial.【C1】______all, healthy people can work longer and harder than si

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问题     The link between health and income seems pretty uncontroversial.【C1】______all, healthy people can work longer and harder than sick people. Healthier children are【C2】______to stay in school longer and learn more【C3】______more when they enter the workforce. Even across countries the【C4】______seems clear: those with better health are【C5】______richer.
    The researchers of the Massachusetts Institute of Technology are skeptical about the notion【C6】______healthier countries are richer, because countries with【C7】______incomes may simply spend more on health. To investigate, they needed to study health improvements that were not【C8】______by economic growth in the countries concerned.
    Beginning in the 1940s several medical【C9】______involving penicillin(青霉素)and DDT(滴滴涕)made it easier to【C10】______diseases-such as tuberculosis(结核病), malaria(疟疾) and yellow fever—that【C11】______people in developing countries. Because these ideas【C12】______in the rich world and were spread by【C13】______such as the WHO, any improvements in【C14】______they led to would have been unconnected with prior improvements in the economic【C15】______of poor countries.
    This international revolution in public health【C16】______lead to substantial increases in life【C17】______in poor countries by the 1950s. However, the researchers found that income per head actually【C18】______when life expectancy went up. The reason was that increased life expectancy led to a higher population using a【C19】______stock of things like land and capital,【C20】______depressing income per person.
【C16】
选项 A、will
B、did
C、should
D、could
答案B
解析 由于此句说明的是在20世纪50年代发生的事情，因此空格处要用过去式。did在此处起到加强语气的作用。结构为“助动词do／did／does+动词原形”，表示强调，意为“的确……”。
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