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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.
【C11】
选项 A、said
B、expected
C、estimated
D、hoped
答案C
解析 本填空考查动词，而且本段落的首句是典型的总结句，即本段落的总述：One priority for research is improving hydrological forecasting．(一个研究的重点就是改进水文预测)，所以本段落的主题已经被概括出来了：hydrological forecasting；之后的分述，本填空所在的句子讲述了：It has been ________ that the world’s water use would triple in next two decades．这里还出现了将来时态would，那么本填空的动作自然与“预测”有关，四个选项中C)estimated(预测)是最为合适的，其他选项A)said(据说)、B)expected(期望)和D)hoped(希望)等动词均不合适。
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