题型:阅读选择 题类: 难易度:普通
山西省晋中市祁县多校2024年中考英语三模试卷
Have you noticed these days the temperature is not so normal?The greenhouse effect(温室效应) is one of the reasons.
How does it work?
A greenhouse is a building with glass walls. In the daytime,sunlight shines into the greenhouse and warms the plants and air inside. At nighttime,it's colder outside,but the greenhouse stays warm inside. That's because the glass walls of the greenhouse keep the sun's heat inside.
The greenhouse effect works much the same way on Earth. Greenhouse gases in the air such as CO2 hold heat like the glass walls of a greenhouse. During the day,the sun shines and Earth's surface warms up in the sunlight. At night,Earth's surface cools,giving heat back into the air. But some of the heat is kept by the greenhouse gases in the atmosphere. That s what keeps Earth warm.
How do humans influence the greenhouse effect?
Human activities are changing Earth's natural greenhouse effect. Burning fuels(燃料) like coal and petrol puts more CO2 into our atmosphere. Too much of these greenhouse gases can cause Earth's atmosphere to hold more and more heat.
What brings down the greenhouse effect on Earth?
Plants can help a lot. All plants—from big trees to tiny plants in the ocean—take in CO2 and give off O2.
Hello! Welcome to our programme! I'm John. I'm in a health club now. I'm having a talk with four students. They are members of this club.
Hi! My name is David. I want to be healthy. Health makes me feel good and helps me to study better. So I joined the club. I come here on Tuesdays and Fridays. I exercise for thirty minutes each time. | |
Hello! I'm Alice. I like to eat hamburgers and candies. My classmates said I looked unhealthy. So I came here to exercise. I come here three times a week and spend fifty minutes each time. Now I look healthy. | |
I'm Ann. I have too much homework to do every day. I often feel tired. I think exercise can make me relax and help me to study better. Although I am very busy every day, I spend forty minutes here. | |
I'm Bill. I always wanted to sleep in class, although I slept nine hours each night. The doctor said I was unhealthy and needed to exercise. So I came here, I find that I'm full of energy after twenty minutes' exercise each day. Now I never sleep in class. |
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