1. In the report, who studies hardest?
阅读理解。 |
Can plants eat people? Probably not, but there are many plants that eat meat. Some of them are big, and they can eat small animals. One famous meat-eating plant is the Venus flytrap (捕蝇草). The Venus flytrap is a very strange plant. It grows in dry parts of the United States. Its leaves are like the pages of a book. They can open and close very quickly. Inside the leaves, there are three small hairs. If a fly touches one of the hairs, the leaf closes quickly. The fly cannot get out. In about half an hour, the leaf presses the fly until it is dead. Then, the plant covers the fly. Slowly, the plant eats the fly. Why do plants do it? Most plants get what they need from the sun, the air and the ground. In some places, the ground is very poor. It doesn"t have all these important things, especially nitrogen (氮). Animal meat has a lot of nitrogen, so some plants eat meat to get what they need. Let"s hope that some of the bigger plants don"t get the same idea! |
1. The Venus flytrap is a kind of . |
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A. plant B. animal C. food D. drink |
2. The Venus flytrap grows in . |
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A. most parts of the world B. some parts of Africa C. dry parts of the United States D. Asia |
3. From the passage, we learn that . |
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A. all plants can eat people B. all plants can eat animals C. some plants Can eat animals D. some plants don"t eat anything |
4. The underlined word "presses" probably means in Chinese. |
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A. 挤压 B. 关上 C. 打开 D. 调高 |
5. Why do some plants eat animal meat? Because . |
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A. plants are dangerous (危险) to animals B. animals are dangerous to plants C. plants want to get what they need from animal meat D. plants get some water |
阅读理解。 |
Leaves are nature"s food factories. Plants take water from the ground through their roots. They take a gas called carbon dioxide (CO2) from the air. Plants use sunlight to turn water and CO2 into glucose. Glucose is a kind of sugar. Plants are glucose as food for energy to grow. The way plants turn water and CO2 into glucose is called photosynthesis. That means "putting together with light". A chemical called chlorophyll helps make photosynthesis happen. Chlorophyll is green. It gives plants their green colour. As summer ends and autumn comes, the days get shorter and shorter. This is how the trees "know" to begin getting ready for winter. During winter, there is now enough light or water for photosynthesis. The trees will rest, and live on the food they have stored during the summer. They begin to close their food-making factories. The green chlorophyll disappears from the leaves. Then, we begin to see yellow and orange colours. A few of these colors stay in the leaves all the time. We just can"t see them in the summer, because they are covered up by the green chlorophyll. Red and purple colors we see in leaves are made mostly in the autumn. In some trees, like maples (枫树), glucose is stored in the leaves after photosynthesis stops. Sunlight and the cool nights of autumn turn this glucose into red. The brown color of trees like oaks (橡树) is made from wastes left in the leaves. |
1. The word "chlorophyll" in the first paragraph means ____ in Chinese. |
A. 叶绿素 B. 氧气 C. 胡萝卜素 D. 蛋白质 |
2. Where is carbon dioxide from? |
A. Ground. B. Roots. C. Sunlight. D. Air. |
3. The way ______ is called photosynthesis. |
A. plants get carbon dioxide from the air B. plants take water from the ground C. plants turn water and carbon dioxide into glucose D. plants use glucose as food for energy to grow |
4. Red and purple colors in leaves are made mostly in ______. |
A. spring B. autumn C. summer D. winter |
5. ______ in the leaves changes into red color in autumn. |
A. Sunlight B. Water C. Glucose D. Chlorophyll |