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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.
【C15】
选项 A、serious
B、infectious
C、unsafe
D、apparent
答案B
解析 本填空考查形容词，被修饰成分为diseases，并且本句子为段落的首句，负责直接总结本段落的主线，所以此处定义出的diseases就是本段落的主题；To prevent outbreaks of ________ diseases in plants，animals and human表达了一个目的，即“为了阻止……疾病在植物、动物和人类中的爆发”，后面的信息就是为了这个目的需要做的事情，即：“more study is needed on how parasites and disease-carrying species—as ________ as humans and other species they ________—are affected by changes in the environment．”这里的线索词parasites(寄生虫)、disease-carrying species(携带疾病的生物)、affected是几个关键信息，既然研究的是这些事物，就说明这种diseases最大的特点是“传染的”，四个选项中确定出答案为B)infectious(传染性的)，其他的都是无关词汇。
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