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  3. Endangered Species Endangered species are plants and animals that are in immediate danger of extinction. Extinction is actua

Endangered Species Endangered species are plants and animals that are in immediate danger of extinction. Extinction is actua

admin2014-02-22  61
问题                             Endangered Species
    Endangered species are plants and animals that are in immediate danger of extinction. Extinction is actually a normal process in the course of evolution. Since the formation of the earth, many more species have become extinct than those exist today. These species slowly disappeared because of changes of climate and their failure to adapt to such conditions as competition and predation(捕食). Since the 1600s, however, the process of extinction has greatly accelerated as a result of both human population growth and technological encroachment(侵犯)on natural ecology systems. Today the majority of the world’s environments are changing faster than the ability of most species to adapt to such changes through natural selection.
    Species become extinct or endangered for a number of reasons, but the primary cause is the destruction of natural habitats(栖息地). Drainage of wetlands(沼泽地), cutting and clearing of forests, growth of cities, and highway and dam construction have seriously reduced available natural habitats. As the various surroundings become fragments, the remaining animal populations crowd into smaller areas, causing further destruction of natural surroundings. Species in these small islands lose contact with other populations of their own kind, thus reducing their genetic variation and making them less adaptable to environment changes.
    Since the 1600s, commercial exploitation of animals for food and other products has caused many species to become extinct or endangered. Introduced diseases and parasites have also greatly reduced some species. Pollution is another important cause of their extinction.
    Some private and governmental efforts have been organized to save declining species. Laws were made in some countries in the early 1900s to protect wild animals from commercial trade and killing. International endeavors are shown in the Convention on International Trade in Endangered Species, approved by 51 nations. Its purpose is to restrict exploitation of wild animals and plants by regulating and restricting trade in certain species. How effective such laws will be in various countries, however, depends on enforcement(实施)and support by the people and the courts. Because of a lack of law enforcement, the willingness of some segments of society to trade in endangered species, the activities of people who catch and kill animals illegally and dealers who supply the trade, the future of many species is in doubt in spite of legal protection.
According to the passage, which of the following is most important in saving declining species?
选项 A、Governments should make some laws to protect endangered species.
B、People should pay more attention to the protection of natural surroundings.
C、Relevant laws must be made and enforced with the support of the people.
D、Some organizations should warn people not to trade in endangered animals.
答案C
解析 细节推理题。根据题干中的saving declining species与原文尾段首句中的save declining species(拯救濒危物种)对应，对答案进行定位。仔细阅读原文尾段，第二句中的Laws were made insome countries是重要的措施。再由原文尾段第五句的转折连词however判定本句中的How effectivesuch laws也是重要的方面，此句中的enforcement为选项C中enforced的同根词，support为选项C的重现。故答案为C。
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