单选题 How Animals Keep Warm
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.
"Sleeping like a dormouse" is not only a common saying but is 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 heart-beats almost cease.
Another instinctive method 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 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, and the little field-mice.

单选题 How does the dormouse defend itself against cold in winter?

【正确答案】 C

【答案解析】[解析] 问题问“睡鼠在冬季里是怎样抵御严寒的?”利用题干中的特征词dormouse作为答案线索，这样找到答案相关句，“Sleeping like a dormouse”…Safe in their (their 指代前面出现的“睡鼠”) nests，or burrows，they．sleep soundly until the warmth of spring arrives．该句说“它们(睡鼠)安全地呆在巢穴里，它们睡得很好，一直要睡到温暖的春天到来(才会醒过来)”，因此判断答案是C。
sound adj．完好的；平静的(睡眠)
e．g．He's in a sound sleep．他现在睡得很好。

单选题 What keeps animals alive during hibernation?

【正确答案】 A

【答案解析】[解析] 问题问“动物在冬眠期间是靠什么活下来的?”该题也是关于具体细节的题，注意题干中的状语(特征结构)during hibernation和核心结构(新信息结构)keeps animals alive，利用它们作为答案线索，找到答案相关句：When winter comes，the dormouse and other hibernating animals have reached a weft-nourished state．They(they是指代dormouse and other hibernating animals)eat very well in warmer days laying down fat in the tissues of their bodies and during hibernation this keeps them alive该题考点：代词this指代内容的确认。根据代词的特点，往往前指，确认this指代前文中的内容“eat very well in warmer days laying down fat in the tissues of their bodies(在温暖的季节里吃得很多，在它们身体组织里存储脂肪。)”判断答案为A。结构“laying down fat in the tissues of their bodies”是现在分词结构作伴随状态，与前面的谓语部分结构“eat very well in warmer days”并列，相当于：eat very well in warmer days and lay down fat in the tissues of their bodies．

单选题 During hibernation, animals breathe

【正确答案】 B

【答案解析】[解析] 该题可借助常识直接判断答案。如果根据原文，利用题干中的核心词breathe作为答案线索，这样发现答案相关句：During hibernation，the temperature of an animal's body drops drastically．Breathing and heart-beats almost cease．(该题考点：考察动词cease的词义和考生的推断能力)。从“呼吸和心跳几乎停止了”可以推出动物的呼吸在冬眠期间一定很慢，因此判断答案是B。
cease v.停止，终了
e．g．At last they ceased working for lack of capital．他们终于由于缺乏资金而停工了。

单选题 According to the passage, what is "migration"?

【正确答案】 A

【答案解析】[解析] 该题考察某个词的词义，可以借助字典直接确认词义，也可以依据原文：Another instinctive method of avoiding intense cold is to escape by means of migration．Wild swans(天鹅),seagulls(海鸥) swallows (燕子) and cuckoos (布谷鸟)are a few of the very many kinds of birds which fly thousands of miles. twice a year ,to a avoid cold.上面的句子说“许多鸟一年两次飞行数千英里，以躲避严寒。”因此判断A(随着季节迁徙)是答案。

单选题 How do ermines survive in winter?

【正确答案】 D

【答案解析】[解析] 利用题干中的特征词ermines，作为答案线索，这样发现答案相关句：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 (填)out with straw (稻草),leaves, moss(苔) and fur. In it they have a "secret place" containing food which they hope will last the winter through!(揭示答案)Animals which fall into this class include the Arctic fox，the rabbit and the ermine，and the little field-mice．从上面划线句的内容看出，ermines(貂)会挖洞，在洞里储存食物，冬天就呆在温暖的洞里，靠洞里存储的食物过冬。