Question

【題目】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 color. 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 foodmaking 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(楓樹), sunlight and the cool nights of autumn turn the glucose in the leaves into a red color. And we can enjoy the beautiful red leaves during autumn.

【1】Which should be in the box?

sunlight＋＋CO2→glucose

A. air B. sugar C. water

【2】The underlined word “chlorophyll” means “ ”．

A. 蛋白質(zhì) B. 脂肪 C. 葉綠素

【3】The leaves turn yellow because they are short of .

A. sunlight and water

B. glucose and energy

C. water and CO2

【4】Which of the following is NOT true?

A. When autumn comes, the days get shorter and shorter.

B. Trees begin to stop making food in summer.

C. During winter some of the yellow and orange colors are still in the leaves.

Answer 1

【答案】

【1】 C

【2】 C

【3】 A

【4】 B

【解析】

短文大意：葉子是世界食品廠。植物通過自己的根吸收地上的水和空氣中的CO2。植物利用陽光將水和CO2轉(zhuǎn)化成葡萄糖。植物用它作為能源和糧食。

【1】細(xì)節(jié)理解題。題干句意：Which should be in the box？sunlight＋＋CO2→glucose哪個(gè)應(yīng)該在方框里？選項(xiàng)A. air 空氣。B. sugar糖。C. water水。結(jié)合原文信息，根據(jù)文中第二段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, a kind of sugar.植物通過根部從地面吸收水分，從空氣中吸收二氧化碳。植物利用陽光將水和二氧化碳轉(zhuǎn)化為葡萄糖,一種糖可知正確答案為：C

【2】詞義猜測(cè)題。題干句意：The underlined word “chlorophyll” means “ ”．帶下劃線的單詞葉綠素的意思是 。結(jié)合原文信息，根據(jù)文中第三段gives plants their green color.賦予植物綠色�？芍�，該詞的意思是葉綠素，故正確答案為：C

【3】細(xì)節(jié)理解題。題干句意：The leaves turn yellow because they are short of .樹葉變黃是因?yàn)樗麄內(nèi)鄙?/span> 。選項(xiàng)A. sunlight and water陽光和水。B. glucose and energy葡萄糖和能量。C. water and CO2 水和二氧化碳。結(jié)合原文信息，根據(jù)文中第四段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.在冬天，沒有足夠的陽光和水。樹木在這段時(shí)間休息，靠夏天儲(chǔ)存的食物為生。他們開始關(guān)閉他們的食品制造工廠。當(dāng)綠色的葉綠素從葉子上消失時(shí)，我們開始看到黃色和橙色的葉子�？芍�正確答案為：A

【4】推理判斷題。題干句意：Which of the following is NOT true？下列哪項(xiàng)是不正確的？選項(xiàng)A. When autumn comes, the days get shorter and shorter.當(dāng)秋天來臨時(shí)，白天變得越來越短。B. Trees begin to stop making food in summer.夏天樹木開始停止生產(chǎn)食物。

C. During winter some of the yellow and orange colors are still in the leaves.在冬天，一些黃色和橙色仍然在樹葉中。結(jié)合原文信息，通讀整篇文章，可知B不正確，故答案為：B