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  3. Man has invented ways to keep warm, but how do animals defend themselves? They cannot reason in the sense that man can, but natu

Man has invented ways to keep warm, but how do animals defend themselves? They cannot reason in the sense that man can, but natu

admin2013-12-08  51
问题     Man has invented ways to keep warm, but how do animals defend themselves? They cannot reason in the sense that man can, but nature has taken care of the animal kingdom by providing animals with special instincts. One of these instincts is known as hibernation(冬眠).
    "Sleeping like a dormouse(睡鼠)" is not only a common saying but a reality. When winter comes, the dormouse and other hibernating animals have reached a well-nourished state. They eat very well in warmer days laying down fat in the tissues of their bodies and during hibernation this keeps them alive. Safe in their nests, or burrows, they sleep soundly until the warmth of spring arrives. Bats, tortoises, snakes, frogs, even insects like butterflies, hibernate more or less completely. Some, like the squirrels, sleep during coldest weather but are roused by a warm spell. During hibernation, the temperature of an animal’s body drops drastically. Breathing and heartbeats almost cease.
    Another instinctive methods of avoiding intense cold is to escape by means of migration. Wild swans, seagulls, swallows and cuckoos are a few of the very many kinds of birds which fly thousands of miles, twice a year, to avoid cold. Many animals, especially those of the Arctic regions, have summer and winter quarters. The Arctic deer of North America, as well as the reindeer of Europe, move southward towards the forests when winter approaches. They return to the northern area when the warmth of spring begins to be sensed. There are animals which do not attempt to leave at the first sign of winter cold. Their instinctive means of defense is to dig out a deep burrow, made soft and warm by padding out with straw, leaves, moss and fur. In it they have a "secret place" containing food which they hope will last the winter through! Animals which fall into this class include the Arctic fox, the rabbit and the ermine(貂)and the little field-mice.
How do ermines survive in winter?
选项 A、They leave their cozy burrows and migrate to warmer lands.
B、They sleep soundly inside their burrows in winter.
C、They dig out burrows and store them with enough food.
D、They stay in their burrows and live on the food stored there.
答案D
解析 本题为细节推理题，提问的是貂(ermines)的过冬方式。根据文章倒数第三句“Their instinctive means of defense is to dig out a deep burrow，made soft and warm by padding out with straw，leaves，moss and fur．”可知，这种过冬方式是挖洞并在洞内存储食物，而文章的最后一句话可以判断貂是这种过冬方式的典型动物，所以由此可以判断答案为D)．
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