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Cho (O, R) đường kính AB. H thuộc OB. Dây CD vgoc AB tại H. d tiếp xúc (O) tại A. CO, DO cắt d tại M và N. CM, DN cắt (O) tại E và F. a) Chứng minh EF // CD; MNFE là thang cân; MNFE nội tiếp và ME=NF,ME.MC=NF.ND b) Gọi K là giao của EF và OA. Chứng minh K là TĐ của EF. Tìm vị trí của H để AEOF là thoi.
Cho ΔABC nhọn nội tiếp (O), (AB<AC), kẻ đường kính AM, 3 đường cao AD,BE,CF cắt nhau tại H, AD cắt (O) tại. a. Chứng minh ΔACM vuông b.Chứng minh ΔABD đồng dạng ΔAMC c.Chứng minh: góc CAM = góc BCK
Một thiết bị điện được đặt dưới hiệu điện thế xoay chiều tần số 100 Hz có giá trị hiệu dụng 220 V. Thiết bị chỉ hoạt động khi hiệu điện thế tức thời có giá trị không nhỏ hơn 220 V. Xác định thời gian thiết bịhoạt động trong nửa chu kì của dòng điện. A. 0,004 s B. 0,0025 s C. 0,005 s D. 0,0075 s
1. The drawing and printing techniques have been and inherited over many generations. A. prevented B. treated C. preserved D. stored 2. Peter was expelled from the volunteer team his misbehavior. A. except for B. because of C. in spite of D. regardless of 3. There is a of employment opportunities in a city. A. group B. change C. type D. variety 4. Skillful hand-weaving techniques of the local make Dinh An sedge mats a wonderful souvenir for visitors. A. artefacts B. artisans C. artists D. actors 5. Maybe we are worried about something so our keeps wandering over a particular issue. A. feeling B. mind C. brain D. impression 6. In the central park, there is a statue from a single block of marble. A. carved B. built C. moulded D. cut 7. The bamboo used to make conical hats must be split into very thin strings and then put into water they can avoid tearing and any breakage. A. so that B. therefore C. because D. although 8. It’s a truth that dogs can hear and see better than humans. A. very B. far more C. a lot D. much more 9. We’d like our students to participate more in the school’s social programmes. A. actively B. comprehensively C. basically D. dynamically 10. “Do you your new classmate?” A. face up to B. keep up with C. get on with D. look forward to 11. Yesterday, a policeman came and explained to us to act and where to get help in emergencies. A. how B. whether C. where D. what 12. All of my teachers, friends and relatives are asking me continually what careers I am interested in and I'm struggling to a decision. A. take B. offer C. do D. make 13. I am unsure as to fashion designing is the right career for me. A. where B. how C. whether D. what 14. I wish I all the natural and man-made wonders of Viet Nam. A. could visit B. am visiting C. visit D. will visit 15. Children in large families learn how to get with other people. A. across B. through C. along D. away II. There is a mistake in the four underlined parts of each sentence. Find the mistakes by circling A, B, C or D. 16. The study of the sculptures of the Cham people is truly fascinated, and some books have A B C D been written about them. 17. I haven’t visited my grandparents when we came to live in the city. A B C D 18. We still haven’t got a sponsor although the fact that we’ve written to dozens of companies. A B C D 19. People in the South speak more direct than people in the North do. A B C D 20. According to many critics, Mark Twain’s novel Huckleberry Finn is his greatest work and is A B is one of the greatest American novelists ever written. C D
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1. Mickey and Donald are two famous ________ in America and over the world. A. comedian B. cartoon characters C. main character D. channel 2. A person who reads the news on television or radio is a ________. A. MC B. newsreader C. weatherman D. weathergirl 3. “Life in the water” is a ________ about the colourful living world in the Pacific. A. comedian B. game show C. channel D. documentary 4. This channel has a lot of interesting programmes. Do you want to check its _______? A. schedule B. series C. volume button D. channel 5 The Face” is a famous ________ in Vietnam where models compete with each other to be the winner. A. game show B. documentary C. cartoon D. comedy 6 Do you know what time the film is ________? A. announce B. broadcast C. watch D. entertain 5. “ 7. I like watching comedies because they are very ________. A. cool B. funny C. cute D.kind 8. This programme attracts millions of ________ all over the world. A. MC B. reporters C. audiences D.newsreader 9. I like this film because it has________ characters and fun songs. A. cool B. stupid C. clumsy D.bad 10 . I want to turn on the TV but I can’t find the ________. A. volume button B.screen C. wheelbarrow D remote control 11 . “The ________ Penguin” is about the adventures of a penguin who has no wings. A. wing B. wingless C. cute D.good 12 . We are trying to ________ the truth about his disappearance. A. announce B. educate C. discover D. do 13 ________is your favourite TV programme? A. Which B. What C. How D. Who 14 ________ do children like cartoon? A. what B. whose C. How D. why 15 The weather is nice________it is a bit cold. A.so B. but C. and D. because 16 ________ do you think you can live without TV? A.How often B. How many C. Which D. How long 17 Phong________ swimming nearly every morning________Summer. A. Go/in B goes /on C.Goes /in D.going/in 18 My father is good at martial art, he can________karate and judo. A. play B.do B. have C. make 19 Kids like watching horor films________they are afraid of them. A. so B. and C. but D.because 20 What do you usually do during break at school? A.I play in the schoolyard B.I cook meal C.I don’t know D.I stay at home.
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