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

There can be many different colors in human skin and it changes with the sunshine, our feelings or our health. This is because of pigments (色素), which reflect light and make what the eye sees as colors. When we feel excited or angry, the heart can send more blood to the face and the pigments in the skin become red.

Plants also have pigments. Colors are 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 we cannot see, and they follow them to the inside of flowers. Without bees visiting flowers in this way, many plants would die out.

Animals also use colors for their own needs. They protect themselves with different colors so as not to be seen by predators. The snowshoe hare, a kind of wild animal, changes colors with seasons for this reason. During summer it has a brown color, and in winter it is white so that it can hide in the snow. However, some animals use colors 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 are many different reasons and uses for colors in the natural world. Some uses of colors in nature remain unknown, but one thing is for sure. Colors not only make our planet beautiful, but they are also necessary for our planet to live on.

根据语篇内容，选择最佳选项。
1．Why does our skin become red when we feel angry?

A．We are in very good health.

B．Our hearts send more blood to our skin.

C．The pigments reflect more bright light.

2．What can we learn from Paragraph 3?

A．Why do flowers look beautiful.

B．Colors are important for plants to live on.

C．Why do insects like bright colors of flowers.

3．What does the underlined word “predators” most probably mean in Chinese?

A．凶猛的动物

B．温驯的动物

C．捕食性动物

4．What does the example of the snowshoe hare in Paragraph 4 mainly tell us?

A．It uses color to protect itself.

B．It has different colors.

C．It is very clever.

5．What’s the structure (结构) of the text?（P—Paragraph）

A． S

B．

C．