题型:阅读选择 题类: 难易度:困难
浙江省金华市南苑中学2024-2025学年九年级上学期12月独立作业检测英语试卷
Why do We Yawn?
①Do you yawn? There are about 20 reasons that scientists think are possible for yawning after research. They do not know exactly why yawning happens, but they do know many facts about yawning.
②We know that everyone yawns in the same way. First you open your mouth slowly. Your mouth stays open for about five seconds. You take in a lot of air and then push it out. Then you quickly close your mouth. We also know that yawning is yawn contagious(传染的).
③Many people say they yawn because they are bored or tired. That might be true. People do often yawn before they sleep and after they wake up. However, we know that people also yawn when they are excited or nervous. Olympic runners, for example, often yawn before a race. Why is that? In 2007, scientists found that a yawn can help a warm brain cool down.
④Some scientists believe that yawning makes you notice things more quickly. When you yawn, you breathe deeply. You also stretch (强化) the muscles (肌肉) in your face, mouth, and neck. Your eardrums stretch, too. Maybe this helps you to be quicker to notice things.
⑤In some countries, people think yawning is not nice. People put their hands over their mouths to cover a yawn. In other countries, people think yawning is healthy. They think that opening the mouth very big can let good things in. When they breathe out, they think that bad things go out of the body with the air.
⑥Scientists do not spend much time studying yawning. That is probably because yawning does not hurt. It is just something we do.
When we are in the wild, we find that water is important for us to live. There are many ways to get some clean water. For example, if there is fire and enough water, the best way is to boil the water. But in many cases, there doesn't seem to be any safe water available.
Can you think of a way of cleaning dirty water by using the sun? In this activity, you will make a "solar still (太阳能蒸馏器)". Let's get started to make pure water (纯净水)!
Things to prepare:☆a wide plastic basin (塑料盆) ☆a large piece of plastic paper ☆a smaller glass for collecting the clean water ☆a thin string (绳子) ☆salt and stone Steps: ⒈Mix salt with water. Put salty water in your basin. ⒉Put your collecting glass in the middle of your basin. ⒊Cover the basin with the plastic paper. Use a string to seal off the edges (封住边缘). ⒋Place a stone in the middle of the plastic paper just above your collecting glass. ⒌Carefully move the solar still into the sun so that the sun can heat (加热) the salty water and turn it into vapor (水蒸汽). … |
China Tai Chi Culture World Tour On Saturday, August 20, a team of Chinese Tai Chi masters started their tour to the United States. They are going there to promote (提升) Chinese Tai Chi culture to overseas Chinese and American Kung Fu fans. They will stay there for two weeks. Led by Chen Zhenglei, a famous Chinese Tai Chi master, other five masters, are included in the group. Some of them are the champions of Tai Chi competition both at home and abroad. "Tai Chi is a national treasure of China that has a deep and long history, and practicing it is good for both body and mind," Chen said at the opening ceremony(开幕式) of the China Tai Chi Culture World Tour. Activities for the tour: ★A lecture on Tai Chi on Sunday at Stanford University. ★Training courses for Tai Chi fans and lovers in the United States, ★Guiding personal skills about how to best practice Tai Chi. Notes: ★Around 150 Tai Chi lovers, both overseas Chinese and Americans, will attend the training. ★These activities are held by Hong Kong Chinese Media Limited. More tickets are available. Book your place by e-mailing Taichi@163.com. ★$15 for members of Taichi Assosiation and $20 for non-members. Half price for a child. All the money will go to Tipping Point, a charity for homeless people in San Francisco. |
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