《2025年阳光学业评价七年级英语上册沪教版》

阅读课文,回答问题
1. What is Saihanba?Saihanba is a forest park.
2. What happened to Saihanba in 1800s?In 1800s, there were forest fires and wars, and people cut down many trees.
3. How did people change Saihanba into a forest?Three generations of forest workers planted trees in Saihanba and turned it into a forest.
4. Why is Saihanba important today?Saihanba is important today because it helps provide the capital with clean water and there are fewer sandstorms in Beijing now.

答案： 1. Saihanba is a forest park. 2. In 1800s, there were forest fires and wars, and people cut down many trees. 3. Three generations of forest workers planted trees in Saihanba and turned it into a forest. 4. Saihanba is important today because it helps provide the capital with clean water and there are fewer sandstorms in Beijing now.

Air is around us all the time. We don't often think about it, but without it, we couldn't survive. Our lungs take in the air and send oxygen to all parts of our body. This helps our muscles work, our brains think, and our hearts beat.
$Air also helps plants grow. Plants take in CO_2 from the air and use sunlight to change it into food. This process also gives off oxygen, which we breathe in. It's a wonderful cycle that keeps us all alive. There is also nitrogen($氮气) in the air, and it is important for plants to grow big and strong.
Wind is moving air. When the sun heats the Earth, hot air rises and cold air moves in to take its place. This movement creates wind. Wind can be gentle or strong. Gentle winds are nice on a warm day, but strong winds can make trees sway and blow things away.
Wind is also useful. People use windmills to make electricity. Wind power is clean and renewable. It's good for the environment. We also use wind to sail boats and fly kites.
Think: Why is air important?

答案： Air is important because humans, animals and plants need air to survive and grow strong. We can also use wind to make electricity and have fun.