一、“自然小课堂”环节，老师给大家介绍了一些科普小知识。请阅读下面短文，根据需要从方框内选择适当的词及其正确形式填空。注意：每空一词，每词仅用一次，有两词为多余项。
but also face same animal chance use easy find they appear because
Do you know why different animals or insects have their own colours? This is because they use different colours to keep themselves safe.
Some birds feed on insects, but it's not 1. for them to catch locusts(蝗虫). Why? This is because locusts change 2. colours to match the food plants. When food plants are green, locusts appear green. When the plants turn brown, locusts 3. turn brown.
Some other insects have to 4. only at night. It is because they have colours different from plants, and birds can 5. them easily and eat them.
If you study animal life, you'll find that the most important 6. of colour is for protection. Tigers and other 7. move quietly through forests. The small animals cannot find them 8. they have the colours much like those of the trees and grass.
In the sea, there's a kind of fish with a soft body. It is not strong at all, but it can send out black liquid(液体) when it 9. danger. The liquid hides the fish from its hunters, giving it a(n) 10. to swim away quickly. That's why we can still see it in the sea.

【解析】：我们可以根据语境、固定搭配和语法规则逐一确定答案：
1. 此处用到固定句型it's + 形容词 + for sb to do sth，结合蝗虫有保护色的语境，可知鸟类抓蝗虫并不容易，填easy。
2. 此处修饰名词colours，要表达“它们的”含义，需将主格they变为形容词性物主代词their。
3. 前文提到植物变绿时蝗虫也变绿，对应植物变棕时蝗虫也变成棕色，填副词also表示“也”。
4. have to后接动词原形，结合语境指这类昆虫只能在夜间出没，填appear。
5. 情态动词can后接动词原形，此处指鸟类可以轻易找到它们然后吃掉，填find。
6. 此处表达“颜色最重要的用途是防护”，use作名词可表示“用途、作用”，填use。
7. other后接可数名词复数，此处指老虎和其他动物，将animal变为复数animals。
8. 后半句是前半句“小动物找不到它们”的原因，填连词because引导原因状语从句。
9. 主语it是第三人称单数，一般现在时谓语动词要用第三人称单数形式，此处表达“面对危险”，将face变为faces。
10. 此处表达“给它一个快速游走的机会”，a后接可数名词单数，填chance。
本题多余词汇为but和same，未被使用。
【答案】：1. easy
2. their
3. also
4. appear
5. find
6. use
7. animals
8. because
9. faces
10. chance

二、Lele 和同学 Sarah 讨论一些世界自然景观之最。根据他们的对话内容，从下面的选项中选出最佳选项填入空白处。选项中有一项为多余选项。
A: Hi, Sarah. What's the biggest rainforest in the world?
B: 1.
A: How big is it?
B: 2.
A: Where is it?
B: 3. It crosses eight countries and most part of it is in Brazil.
A: Oh, you know so much about it.
B: Well, I learned about it in a magazine last week.
A: Could you tell me anything more about it?
B: Of course. 4.
A: It must be very special and beautiful.
B: Yes, it is. 5.
A: Why?
B: Because people cut down lots of trees every year.
A: That's too bad.
A. It is in South America.
B. How did you know it?
C. It is the Amazon rainforest.
D. It is about 7 million square kilometres.
E. About 20% of the birds in the world live in it.
F. But it is becoming smaller and smaller in size these years.

1. C 2. D 3. A 4. E 5. F

我们可以根据对话上下文的问答逻辑匹配对应选项：
1. 第一空的问句是“世界上最大的雨林是什么”，对应回答点明它是亚马逊雨林，选C。
2. 第二空的问句是“它的面积有多大”，对应回答给出面积数值，说明它大约有700万平方公里，选D。
3. 第三空的问句是“它在哪里”，对应回答说明它的地理位置，它在南美洲，选A。
4. 第四空是回应对方“能不能介绍更多相关信息”的请求，补充说明雨林的相关特点：世界上约20%的鸟类都栖息在这里，选E。
5. 第五空后文紧接着询问原因，后续解释是人类大量砍伐树木，对应说明近些年它的面积正变得越来越小，选F。
多余选项为B。