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emlabuitiendat2001
2 năm trước
Cho tam giác BFC cân tại B.Kẻ FE vuông với BC tại E ,CA vuông với BF tại A. a)Chứng minh tam giác BEF=tam giác BAC b)FE cắt CA tại D.Chứng minh BD là tia phân giác của góc ABC c)Gọi M là trung điểm của FC .Chứng minh BM vuông với AE Mong các bạn giúp mk nha
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ANH 7: TEST 1 I: Choose the correct option A, B, C or D to complete the sentences. 1. Solar energy __________ by many countries in the world in the future. A. use B. will use C. will be using D. will be used 2. __________ is a renewable sourse. A. Coal B. Oil C. Wind D. Gas 3. You can wear a __________ on your back to fly anywhere easily in the future. A. jet pack B. flying car C. teleporter D.high-speed bicycle 4. In the future most people will travel __________ flying train. A. in B. at C. on D. at 5. Do you think we __________ driverless car in the future? A. use B. to use C. will use D. have used 6. That picture is __________ A. us B. ours C. our D. we 7. ___________ is a single-wheel bike. A. Monowheel B. Hover scooter C. Segwey D. Teleporter 8. Nuclear energy can provide electricity for the world needs, but it is __________ A. cheap B. unlimited C. dangerous D. safe 9. You can ___________easily on the Dead Sea. Why? – Because it’s so salty A. fly B. walk C. drive D. float 10. Biogas helps solve the problem of indoor ___________. A. noise pollution B. air pollution C. water pollution D. soil pollution II. Find the word which has a different sound in the part underlined 1. A. new B. sew C. few D. knew 2. A. large B. hard C. carbon D. marry 3. A. tool B. blood C. spoon D. noon 4. A. report B. transport C. short D. power 5. A. plays B. wants C. looks D. helps 6. A. truck B. abundant C. nuclear D. dump 7. A. decided B. played C. listened D. enjoyed 8. A. biogas B. solar C. hydroelectric D. environment 9. A. pleasure B. meat C. heat D. beat 10. A. energy B. electric C. plentiful D. renewable 11. A. let B. jet C. vehicle D. success III: Read the passage and tick () True or False. Energy is fundament to human beings. Many poor people in developing countries do not have modern sources of energy like electricity or natural gas, with which their life can be improved. People who live in mountainous areas have to gather wood for fuel. This takes a lot of time. For many people living in rural areas, biogas is the largest energy resource available. The main use of biogas is for cooking and heating, but it can also provide energy for public transport. As biogas is smoke-free, it helps the problem of indoor air pollution. Moreover, it is made from plant waste and animal manure. They cost almost nothing. The tendency to use renewable energy sources in developing sources in developing countries is on the increase as non-renewable ones are running out. In the future, the wind and the sun will be uses as the most important environmentally friendly energy sources True or False? True False 1. Non-renewable sources are being used up. 2. Many poor people in developing countries do not have little electricity 3. Biogas is a new source of energy available for poor people.

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