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2. How many oxygen atoms are there in a molecule?
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3. What elements participate in the formation process of ozone?
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4. What happens when an oxygen molecule and an ultraviolet radiation hit each other?

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5. What is the feature of single atoms?
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D. SPEAKING

XI Work in groups of four. List different kinds of pollution in the boxes below.

Now discuss with your partners to find out the effects of pollution on people and on
environment. Use the pictures below as suggestions.

A B C

D E F

G H I

F
Write in the columns below:

Big 4 - Bộ đề tự kiểm tra 4 kỹ năng Nghe - Nói - Đọc - Viết tiếng Anh (cơ bản và nâng cao) lớp 8 tập 2| 11