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 resear-chers【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.
【C8】

选项 A、hold
B、receive
C、gain
D、pay

答案C

解析 本题考查动词。其主语是researchers,而宾语为a better understanding of these problems。A项hold表示“拥有,持有”,如用在此处就意味着researchers已经有了a better understanding of these problems,因此不合适;B项receive表示“收到”,并且不能与这个宾语搭配;D项pay表示“付出”,明显不符合原文所要表达的意思;只有C项gain表示“获取”,即“帮助研究员对这些问题取得更好的理解”,所以C项gain为最佳答案。
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