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.
【C18】

选项 A、referred
B、distributed
C、contributed
D、attributed

答案C

解析 本填空考查动词词组,其主语为:The overuse of antibiotics both in humans and in farm animals(在人体以及牲畜中过量使用的抗生素);其宾语为:the growth of antibiotic-resistant micro organism(抗生素抗药能力的增长);分析这两个线索之间的关系,很容易定位出本句缺少的动词应意为“导致……现象的发生”;四个选项中A)referred(to)和B)distributed(to)与题意无关;选项D)attributed(to)意为“把某事归因于”,且attributed是应该有宾语的,不符合本填空;最佳选项为C)contributed(to),意为“贡献、导致、造成”。
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