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Unit3 Topic 2 Section A 仁爱版 九年级上册
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你可能喜欢Do you want to know how and why a fall leaf changes color? We first have to understand what leaves are and what they do.Leaves are the world’s food factories. Plants take water from the ground through their roots and take CO2 from the air. Plants use sunlight to turn water and CO2 into glucose(葡萄糖), a kind of sugar. Plants use it as food for energy and growing.A chemical called “chlorophyll” in the leaves gives plants their green colour. As summer ends and autumn comes, the days get shorter and shorter, and trees “know” to begin getting ready for winter.During winter, there is not enough sunlight or water. Trees rest during this time and live on the food they store during the summer. They begin to shut down their food-making factories. As the green chlorophyll disappears from the leaves, we begin to see yellow and orange leaves.The bright reds and purples we see in leaves are made mostly in autumn. In some trees, like maples, sunlight and the cool nights of autumn turn the glucose in the leaves into a red colour. And we can enjoy the beautiful red leaves during autumn.Which should be in the box sunlight+ ?+CO2glucoseA．airB．sugarC．waterD．windThe underlined word “chlorophyll” means __________.A．叶绿素B．脂肪C．蛋白质D．淀粉The leaves turn yellow because they are short of(缺少) __________.A．water and CO2B．glucose and energyC．sunlight and waterD．sunlight and CO2Which of the following is NOT true?A．When autumn comes, the days get shorter and shorter.B．During winter trees live on the food they store in summer.C．During winter some of yellow and orange colors are still in the leaves.D．Trees begin to stop making food in summer.This passage tells us_____________.A．the plants can grow well only with the sunlightB．there are all kinds of plants on the earthC．not all the colors of the leaves are from chlorophyllD．maple leaves change the color as other trees2015届江苏余桥实验学校九年级上学期第四次月考英语试卷（带解析）答案}