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cover; lungs; fresh and clean; hold the water; keep cycling; control the weather; the beauty of nature; die out; give useful things; protect
(2). Read the passage together.
Forests cover 22% of the earth’s surface. Forests are very important to us. They are the lungs of the earth. The plants in the forests help to make the air fresher and cleaner. They also help to hold the water when it rains and keep the water cycling. They play an important part in controlling the climate. Forests also help to keep the beauty of nature. Without forests, many beauty plants and animals would die out. Forests give us food, wood, fruit, medicine, and many more useful things. We need forests for many reasons. But now, forests are becoming smaller and smaller, so we should protect them.
(3). Answer the question
Q1: The forest are very important to us . But, “What are the trees’ functions?/Do you know trees’ functions?”
4. Talk about the population of China
Answer the questions
Q1: What 's the population of China ?
Q2. What problem does the large population cause in China?
Q3. The population problem is very serious. What measures has our government taken to solve the problem?
5.Pollution
Answer the questions
(1)Q: How many kinds of pollution do you know?
(2)看图写话
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Task5. Pollution（看图写话）
chemicals destroy
soil unhealthy
pour river
noise make
noise high blood pressure
terrible bad
make mess
throw around
sore breathing
make sick
6.What can we do to protect the environment?
Q1: What should we reduce?
Q2: What about reusing?
Q3: How to recycle?