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  3. One of the most pressing challenges the world will face in the next few decades is how to alleviate the growing stress that huma

One of the most pressing challenges the world will face in the next few decades is how to alleviate the growing stress that huma

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问题     One of the most pressing challenges the world will face in the next few decades is how to alleviate the growing stress that human activities are placing【C1】________the environment. The consequences are just too great to【C2】________. Wildlife habitats are being degraded or disappearing altogether as new developments【C3】________more land. Plant and animal species are becoming【C4】________at a greater rate now than at any time in Earth’s history.【C5】________many as 30 percent of the world’s fish stocks are over-exploited. And the list goes on.
    【C6】________, there is reason to have hope for the future. Advances in computing power and molecular biology are among the tremendous increases in scientific capability that【C7】________helping researchers【C8】________a better understanding of these problems. Recent development in science and technology could provide the【C9】________for some major and timely actions that would【C10】________our understanding of how human activities affect the environment.
    One priority for research is improving hydrological forecasting. It has been【C11】________that the world’s water use would triple in the next two decades. Already, widespread water【C12】________have occurred in parts of China, India, and North Africa. The need for water also is taking its toll on fresh water ecosystems in the United States. Only 2 percent of the nations’ stream are considered in good【C13】________, and【C14】________to 40 percent of native fish species are rare to extinct.
    To prevent outbreaks of【C15】________diseases in plants, animals and human, more study is needed on how parasites and disease-carrying species—as【C16】________as humans and other species they【C17】________—are affected by changes in the environment. The overuse of antibiotics both in humans and in farm animals has【C18】________to the growth of antibiotic-resistant micro organism. Researchers can take【C19】________of new technologies in genetics and computing to better monitor and【C20】________the effects that environment changes might have on diseases outbreaks.
【C13】
选项 A、health
B、condition
C、status
D、situation
答案B
解析 本题选择名词，关键也是分析原文信息中隐藏的提示性线索；首先前句中的原文信息为：The need for water also is taking its toll on flesh water ecosystems in the United States．also提示的递进关系说明了本段之后的信息也是在进一步谈论有关水的问题，而且是关于“fresh water ecosystems(洁净水生态系统)”；下一句就是本填空所在的句子，在谈论：Only _________ percent of the nations’ stream are considered in good  ________  ，此处的nations’ stream指的就是“国家的水源”，既然又是在谈论洁净水生态系统，答案最恰当的就是B)condition，in good condition就是“处于良好的状态中”，即洁净水的概念；其他选项A)health表示的“健康”更多是指人；而C)status和D)situation是指一件事情的状态和形势，均不如选项B)condition贴切。
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