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lethephiet
2 năm trước
Thấu kính hội tụ có tiêu cự 4cm ,vật AB vuông góc với trục chính cho ảnh A'B' ảnh thật lớm gấp 2lần vật xác định vị trí vật ảnh. tìm vị trí vật và vẽ ảnh
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VIII. Choose the correct answers to complete the passage. Three ways everyone can help make the Earth a greener place is to reduce, reuse, and recycle! When people reduce it means they are using (1)________ of something. This allows us to create less waste. Turning off the faucet when we brush our teeth is a simple way to reduce. This is a small action that prevents us from wasting (2)________. Another small action people can take is to reuse things we already have. Taking bags to the store (3)________ we shop for food is one way to reuse them. Using both (4)________ of piece of paper before getting a new one is another way to reuse. (5)________ is when new materials are created from old ones. Paper, plastic, and metal are all materials that can be recycled. Things like newspapers, soda cans, and plastic bags can all be turned (6)________ new objects if we take the time to recycle them! 1. a. much b. more c. little d. less 2. a. energy b. electricity c. water d. time 3. a. when b. what c. how d. while 4. a. ways b. sides c. parts d. points 5. a. Reusing b. Reducing c. Recycling d. Reacting 6. a. out b. up c. down d. into

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