Question

【題目】根據(jù)短文內(nèi)容，從短文后的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)。選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。

Many of us feel sleepy in winter, but other species often take it a step further and hibernate (冬眠). 【1】 The body slows down and breathing, temperature and metabolic and heart rate all decrease. Dormice (睡鼠) head underground and hedgehogs (刺猬) hunker down in their nests.

Hibernation seems to do them good. But human cannot bed down for long periods. 【2】 To work out why we do not, first we need to find out why animals do. The most obvious reason for hibernating is to avoid the cold. Conditions are harsh and there is little food to eat, as fewer plants are growing. 【3】 Then they live off body-fat reserves until it’s time to wake up.

But a 2015 study of dormice found that they continued hibernating even when cold conditions had ended. 【4】 The key issue seemed to be connected with their main food: beech trees. The dormice need their seeds to reproduce, or for the baby dormice to gain enough body fat. In a harvest year, they produce plenty of seeds. Somehow the dormice could predict it. Otherwise, they stop reproduction these years and increase their survival by staying underground.

【5】 By staying out of sight, the dormice avoided being hunted by their predators (天敵) like owls. Until recently people thought hibernation was just about energy saving, a defense against cold weather and food shortage, and now we think it’s more predator avoidance. The survival rates in hibernation are close to 100%.

A. So obviously there are other reasons.

B. They were hibernating underground to save energy.

C. Hibernation is an extended period of energy-saving state.

D. All kinds of animals hibernate, from insects to birds and primates.

E. Why, if it is so beneficial, do we not hibernate?

F. The dormice had another reason to stay underground.

G. So many animals fatten themselves up during summer.

Answer 1

【答案】

【1】B

【2】E

【3】G

【4】A

【5】F

【解析】

試題分析：本文屬于說(shuō)明文閱讀，介紹了動(dòng)物冬眠的原因：節(jié)省能量。同時(shí)告訴我們有時(shí)候冬天結(jié)束以后，動(dòng)物還在冬眠是因?yàn)樗麄兊戎�食物的出現(xiàn)。

【1】B 根據(jù)橫線前句Many of us feel sleepy in winter, but other species often take it a step further and hibernate.可知其他動(dòng)物在冬天會(huì)冬眠。橫線后句The body slows down and breathing, temperature and metabolic and heart rate all decrease.介紹冬眠的時(shí)候，動(dòng)物的身體特征。橫線句必須是連接上下文，故B項(xiàng)“They were hibernating underground to save energy.”符合上下文串聯(lián)。

【2】E 根據(jù)橫線前兩句Hibernation seems to do them good. But human cannot bed down for long periods.可知冬眠對(duì)動(dòng)物是偶好處的，而我們?nèi)祟愂遣豢赡芩�那么長(zhǎng)時(shí)間的。因?yàn)閯?dòng)物的冬眠是為了節(jié)約能量。故E項(xiàng)“Why, if it is so beneficial, do we not hibernate?既然冬眠有這么多的好處，那么為什么人類不冬眠的？”符合上下文串聯(lián)。

【3】G 根據(jù)橫線后句Then they live off body-fat reserves until it’s time to wake up.可知冬眠的動(dòng)物依靠?jī)?chǔ)存在體內(nèi)的能量過(guò)冬。那么前句應(yīng)該敘述動(dòng)物在夏天努力儲(chǔ)存一定的脂肪以備冬眠消耗。故G項(xiàng)符合上下文串聯(lián)。

【4】A 根據(jù)前句But a 2015 study of dormice found that they continued hibernating even when cold conditions had ended.可知睡鼠在冬天結(jié)束以后還在冬眠。那么肯定存在其他的原因，故A項(xiàng)“So obviously there are other reasons.”符合上下文串聯(lián)。

【5】F 根據(jù)橫線后句By staying out of sight, the dormice avoided being hunted by their predators (天敵) like owls.在介紹睡鼠繼續(xù)冬眠的其他原因。故F項(xiàng)“The dormice had another reason to stay underground”起著承上啟下的作用，符合上下文串聯(lián)。