1. (2022·哈尔滨模拟) 根据短文内容选择最佳答案。

The natural world is colorful with humans, plants and animals showing different colors.

Human skin can be many different colors 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 colors. So when we feel excited or angry, our heart can send more blood to the face and the pigments in the skin become red. This is why we have the expression that someone "sees red" when they are angry.

Plants also have pigments. Color is important for them to live on. The bright colors of flowers catch the attention of insects which then carry their pollen (花粉) from one flower to another. Bees can see colors that we cannot see, 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 color for their own need. They protect themselves with different colors in order not to be seen by predators. During summer some wild rabbits are brown, and in winter they are white so that they can hide in the snow so they can't be found or eaten. However, some animals use color as a warning to make predators stay away. Bright colors such as yellow and red are often used in this way. Nature, however, is very clever, and predators also use colors to attract the animals they feed on.

So we can see that there may be many different reasons and uses for colors in the natural world. Some uses of color in nature remain ( 保 持 ) unknown, but one thing is for sure: color not only makes our planet beautiful but it is also necessary for our planet to live on.

1. （1） The underlined word " predators " in the fourth passage means "    " in Chinese .

   A . 捕食者 B . 生产者 C . 消费者
3. （2） Pigments（色素) can be found in the bodies of        .

   A . humans and plants B . plants and animals C . humans, plants and animals
5. （3） If bees don't carry pollen from one plant to another, many plants will       .

   A . be dry B . be in need C . die out
7. （4） Which of the following is TRUE according to the passage?

   A . When someone feels angry, the face can send more blood to the heart and the pigments in the skin become red. B . Some wild rabbits are white in winter and black in summer. C . We haven't known all the uses of color in nature.
9. （5） Which is the main purpose of the passage?

   A . To explain the importance of protecting our planet. B . To introduce the uses of colors for life on the earth. C . To describe animals' ways of life.