19.Why do so many climbers risk their lives? 为什么这么多登山者愿意冒生命危险？

【解析】risk one's life to do sth 某人舍命做某事 There is a risk of sth/ doing sth 有（做）某事的危险 take risks 冒险

20. One of the main reasons is because people want to challenge themselves in the face of difficulties.

最主要的原因之一是因为人们在面临困难的时候想挑战自我。

【解析1】challenge v/n 挑战face a challenge 面临挑战challenge sb. to sth向某人挑战 He challenged me to a race.他向我挑战赛跑。challenge sb. to do sth 向某人挑战......

【解析2】in the face of 面对（问题、困难等）They showed courage in the face of danger. 面对危险他们表现出了勇气。

21.The spirit of these climbers shows us that we should never give up trying to achieve our dreams.

这些登山者的精神告诉我们， 我们应该从不放弃实现自己的梦想。

【解析】achieve v 获得；达到； 实现 → achievement n 完成； 成绩achieve one's dream = one's dream comes true实现某人的梦想

词条 是否接宾语 用法 achieve 是 主语一般为"人" come true 否 主语一般是"梦想；理想" 22. It also shows that humans can sometimes be stronger than the forces of nature.它还告诉我们， 人类有时候比自然的力量更强大。

【解析1】human n 人；人类 No human could live like this .没有人能这样生活。

【解析2】force ① n 力量； the forces of ... .......的力量 The force of human is great.② V. 迫使；强迫

force sb. to do sth 强迫某人做某事Nobody can force me to do something.

【解析3】nature 不可数名词 "自然界；大自然"→ natural adj. 自然地in nature 在自然界中

1. The elephant weights many times more than this panda.

这头大象的重量是这只熊猫的很多倍。

【解析1】weigh v 称......的重量 → weight n 重量【记】 She weighs herself every day and wants to lose weight.【解析2】time ①"是......的几倍"主语 + 数词 + times + as +形容词+ as +被比较的内容Our new school is four times as big as the old one. ②"次数" 一次 once 两次 twice 三次及三次以上 ： 基数词 + times three times 三次 three or four times 三到四次

【短语】many times 很多倍 last time (在)上次......时 every time 每次/每回...... each time 每当......时

the first time 第一次......时 next time (当)下次......时 【句型 】

It's time for sth . 或 It's time ( for sb . ) to do sth . 意为：该是......的时候了

It's time for dinner . 该是吃晚餐的时候了。 It's time for children to go to bed . 是小孩睡觉的时候了。

2.At birth, a baby panda is about ___ to ____ kilos.刚出生的小熊猫幼崽约___到 ____公斤。

【解析】at birth 出生时 （用作时间状语）give birth ( to sb/ sth) 生孩子；产仔

3. A panda can live up to ___ to ____ years. 一只熊猫活____ 年到____ 年

【解析】up to 高达 up to +数量词 达到 （某数量、程度等）；至多I can take up to four people in my car.直到 （现在）Up to now , Tony has been very quiet be up to sb. "由某人决定"

- Shall we go out or stay in ?- It's up to you.

4. Lin Wei and the other panda keepers are preparing the milk for the baby pandas' breakfast.林微和其他熊猫饲养员们正在给熊猫幼崽准备牛奶作为早餐。

【解析1】the other 其他的 （指两个事物或两个人中的"另一个"， 后接名词时，表示"其他的人或物"；

One.... The other ... （两者中）一个......， 另一个........the others=the other +复数名词

the other的复数形式是the others "其他东西，其余的人"。特指某一范围内的"其他的（人或物）"。

Two boys will go to the zoo, and the others will stay at home. 两个男孩将去动物园，其余的留在家里。 :学

【解析2】prepare...for... 为......准备......1). prepare sth.表示"准备......"，后接名词或代词作宾语。

Our English teacher was preparing the lessons when I came into the office. 我进办公室时，我们的英语老师在备课。

2). prepare to do sth.表示"准备做...."。They were preparing to cross the river when it began to rain. 他们正准备过河，突然下雨了。

3). prepare for sth.表示"为......做准备"。The students are busy preparing for the final exam.学生们正在准备期末考试

5. At 9:00 a.m, they find that most of the babies are already awake and hungry.上午9:00的时候，他们发现大部分熊猫幼崽已经醒来并且饿了。

【解析】awake adj. 醒来 （反义词）asleep 睡着的 She was awak all night.

V. 唤醒；使醒来 = wake up The noise awake me.

6. When the babies see the keepers, they run over with excitement and some of them even walk into their friends and fall down! 当熊猫幼崽们看到饲养员时便激动地跑了过来，有些甚至撞倒它们的伙伴，绊倒在地！

【解析1】run over 撞倒 run →ran→ run→ running → runner 赛跑的人

【短语】run after 追逐,追求 run away from 从......跑掉;逃避 run out (某物)被用完 run out of 用完(某物)

run into 无意间碰到,和......相撞

【解析2】excitement 激动；兴奋

be excited about 对......感到激动 to one's excitement 使某人兴奋的是

【解析3】fall down 跌倒fall "落下，跌落，降落"，指在重力的作用下落下，或失去平衡而跌落The leaves fall in the autumn.

fall down强调的是"滑倒、倒下"，后接宾语时应加上介词fromThe book fell down from the table to the floor.

【短语】 fall down 倒下 fall over 落在...之上, 脸朝下跌倒 fall off 下降, 跌落 fall over"向前摔倒、跌倒"。

7. The baby often die from illness and do not live very long.