关于水循环的英语作文.docVIP

书面表达 下面的一幅图描述了水的循环过程。请根据这幅图用英语写一篇科普短文。 生词：evaporate v. 蒸发；condense v. 凝缩；water vapor 水蒸气 注意：1. 短文须包括图的内容，并结合相关科学的知识，使短文正确、连贯。 2. 词数100左右。 Sample: The Water Cycle The heat of the sun evaporates water from the oceans, seas, rivers and lakes. Water vapor is formed. This rises and forms clouds in the air. As the clouds rise, they are cooled. The higher they rise, the more they are cooled. This causes more and more water vapor to condense. In this way, the tiny drops of water in the clouds get bigger and bigger until they are heavy enough to fall to the earth as rain. Some of rain water sinks into the ground. It may be used up by thirsty plants. Most of the water goes back to the rivers, seas and oceans. This process, called the water cycle, then starts all over again. Useful expressions in this unit 1. The water is being used to/for… 4. If we…, we can… 2. We should/could… 5. It could be better to … 3. What will we do if…? 6. Can you think of a better way to…? As many as 7 billion people throughout the world could face a water shortage by 2050 if the present situation continues. By then, the global population is expected to reach 9.3 billion. Many big cities, including Beijing, Shanghai and Tianjin, will suffer severe water shortages.