一、“自然小课堂”环节，老师给大家科普了一些小知识。请阅读下面的短文，从方框内选择适当的词，并根据需要用其正确形式填空。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 plants are green, locusts appear green. When 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 easily 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.

1. easy 2. their 3. also 4. appear 5. find 6. use 7. animals 8. because 9. faces 10. chance

本题考查选词填空，需结合语境、语法规则对单词进行正确变形，保证每词仅用一次：
1. 此处符合固定句型it's + 形容词 + for sb. to do sth.，根据前文转折逻辑，可知抓蝗虫对鸟类来说并不容易，填easy。
2. 此处修饰名词colours，指代蝗虫的颜色，需要将主格they变为形容词性物主代词their，意为“它们的”。
3. 前文提到植物变绿时蝗虫也呈现绿色，对应植物变棕时蝗虫也同样变棕，填副词also，意为“也”。
4. have to后接动词原形，根据语境这类昆虫只能在夜间活动露面，填appear，意为“出现、出没”。
5. 情态动词can后接动词原形，根据语境鸟类可以轻易找到这类昆虫然后吃掉，填find，意为“找到”。
6. 此处表达颜色最重要的作用是防护，use可作名词表示“用途、作用”，符合语境。
7. 此处表达老虎和其他动物，other后接可数名词复数，将animal变为复数形式animals。
8. 后半句是前半句“小动物很难发现它们”的原因，填连词because，意为“因为”。
9. 此处表达当它面对危险时，主语it是第三人称单数，句子为一般现在时，将face变为第三人称单数形式faces。
10. 此处为固定搭配a chance to do sth.，意为“做某事的机会”，填chance，符合“给它快速游走的机会”的语境。
本题多余词but、same未使用，符合题目要求。

二、Lele 在和同学 Sarah 讨论世界自然景观之最。请通读他们的对话，根据对话内容，从下面的选项中选出能填入空白处的最佳选项。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

我们可以根据上下文的问答逻辑逐一匹配选项：
1. 第一空：上文A询问世界上最大的雨林是什么，对应回答要指出雨林的名称，C选项“它是亚马逊雨林”符合语境。
2. 第二空：上文A询问它的规模有多大，对应回答要描述面积大小，D选项“它的面积大约是700万平方公里”符合语境。
3. 第三空：上文A询问它的位置，对应回答要说明所处的大洲，A选项“它在南美洲”和后文“它跨越8个国家，大部分区域在巴西”的地理描述逻辑连贯。
4. 第四空：上文A请求对方介绍更多关于这片雨林的信息，E选项“世界上约20%的鸟类都栖息在这里”是补充雨林的相关特点，也呼应了后文A感慨它特别又美丽的表述。
5. 第五空：后文A询问原因，B回答人类每年砍伐大量树木，F选项“但是近些年它的面积正变得越来越小”引出后续的原因提问，逻辑通顺。
多余选项B不符合对话上下文的问答逻辑。