四、阅读理解。
The natural world is colourful with humans, plants and animals showing different colours. Human skin can be many different colours and it changes with the sun, our feelings, or our health. This is because of pigments (色素), which reflect light and make what the eye sees as colours. So, when we feel excited or angry, our heart sends more blood to the face and the pigments in the skin become red.
Plants also have pigments. Colours play an important role in their life. The bright colours of flowers catch the attention of insects. Then the insects carry the pollen (花粉) from one flower to another. Bees can see colours we cannot, and they follow these to the inside of the flower. Without bees visiting flowers in this way, many plants would die out.
Animals also use colours for their own need. They protect themselves with different colours in order not to be seen by predators. The snowshoe hare, for example, a type of wild rabbit, changes colours with seasons for this reason. During summer it is brown, and in winter it is white so that it can hide in the snow. However, some animals use the colour as a warning to frighten predators away. Bright colours such as yellow and red are often used in this way.
So, we can see that there may be many different reasons for colours and uses of colours in the natural world. Some uses of colours in nature remain unknown, but one thing is for sure—colours not only make our planet beautiful, but they are also necessary for our planet to live on.
1. What helps plants to attract insects?
A. Leaves.
B. Colours.
C. Fruits.
D. Pollen.
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2. Why does the writer talk about the snowshoe hare in Paragraph 3?
A. To show animals can use colours to protect themselves.
B. To explain how seasons have a great influence on animals.
C. To show animals use colours as a warning to keep predators away.
D. To explain why some animals use yellow and red to make themselves attractive.
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3. The underlined word “predators” refers to animals which ______.
A. hide in secret places
B. kill other animals for food
C. change colours with seasons
D. protect themselves from danger
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4. (创新考法·篇章结构)Which of the following shows the structure of the text?

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5. Which is the main purpose of the text?
A. To describe animals' ways of life.
B. To explain the importance of protecting our planet.
C. To introduce the uses of colours for life on the earth.
D. To tell the differences between plants and animals.
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1. B
2. A
3. B
4. A
5. C

翻译:
### 四、阅读理解
自然界是多彩的，人类、植物和动物呈现出不同的颜色。人的皮肤可以有许多不同的颜色，并且它会随着阳光、我们的情绪或健康状况而变化。这是因为色素，它们反射光线，使眼睛看到的东西呈现出颜色。所以，当我们感到兴奋或愤怒时，我们的心脏会把更多的血液送到脸上，皮肤里的色素就会变成红色。
植物也有色素。颜色在它们的生命中起着重要的作用。花朵鲜艳的颜色吸引昆虫的注意。然后昆虫把花粉从一朵花带到另一朵花。蜜蜂能看到我们看不到的颜色，它们跟着这些颜色进入花的内部。如果没有蜜蜂以这种方式拜访花朵，许多植物将会灭绝。
动物也为了自身的需要使用颜色。它们用不同的颜色保护自己，以免被捕食者发现。例如，一种叫做雪鞋兔的野兔，就因为这个原因随着季节变化颜色。夏天它是棕色的，冬天它是白色的，这样它就可以藏在雪里。然而，一些动物用颜色作为一种警告来吓退捕食者。像黄色和红色这样鲜艳的颜色经常被这样使用。
所以，我们可以看到，在自然界中，颜色的存在和颜色的用途可能有很多不同的原因。自然界中颜色的一些用途仍然未知，但有一件事是肯定的——颜色不仅使我们的星球美丽，而且对于我们的星球上的生物生存也是必要的。
1. 什么帮助植物吸引昆虫？
A. 叶子。
B. 颜色。
C. 果实。
D. 花粉。
2. 作者在第三段为什么谈到雪鞋兔？
A. 为了表明动物可以用颜色来保护自己。
B. 为了解释季节对动物有多大的影响。
C. 为了表明动物用颜色作为警告来赶走捕食者。
D. 为了解释为什么一些动物用黄色和红色使自己有吸引力。
3. 划线单词“predators”指的是______的动物。
A. 藏在秘密的地方
B. 捕杀其他动物为食
C. 随着季节变化颜色
D. 保护自己免受危险
4. （创新考法·篇章结构）以下哪一项展示了文章的结构？
5. 这篇文章的主要目的是什么？
A. 描述动物的生活方式。
B. 解释保护我们星球的重要性。
C. 介绍颜色对地球上生命的用途。
D. 讲述植物和动物之间的区别。