THOMAS EDISON On the night of 21 October 1931, millions of Americans took part in a coast-to-coast ceremony to commemorate the passing of a great man. Lights (21) _____ in homes and offices from New York to California. The ceremony (22) _____ the death of arguably the most important inventor of (23) _____ time: Thomas Alva Edison. Few inventors have (24) _____ such an impact on everyday life, and many of his inventions played a crucial (25) ____in the development of modem technology. One should never underestimate how revolutionary some of Edison's inventions were. In many ways, Edison is the perfect example of an inventor - that is, not just someone who dreams up clever gadgets, but someone whose products transform the lives of millions. He possessed the key characteristics that an inventor needs to (26) _____ a success of inventions, notably sheer determination. Edison famously tried thousands of materials while working on a new type of battery, reacting to failure by cheerfully (27) _____ to his colleagues: 'Well, (28) _____ we know 8,000 things that don't work.' Knowing when to take no (29) _____ of experts is also important. Edison's proposal for electric lighting circuitry was (30) _____ with total disbelief by eminent scientists, until he lit up whole streets with his lights. 21. A. turned out B. came off C. went out D. put off 22. A. marked B. distinguished C. noted D. indicated 23. A. whole B. full C. entire D. all 24. A. put B. had C. served D. set 25. A. effect B. place C. role D. share 26. A. gain B. make C. achieve D. get 27. A. announcing B. informing C. instructing D. notifying 28. A. by far B. at least C. even though D. for all 29. A. notice B. regard C. attention D. view 30. A. gathered B. caught C. drawn D. received

Giúp mik vs ạ,mik đag cần gấp,mik cảm ơn trc

Mình cần gấp, giúp mình với ak. Cảm ơn nhìu.

Giúp em vs mai kt r thank nhiều

ở đậu hà lan hạt vàng A , hạt xanh a , vỏ nhăn B , vỏ trơn b , chín muộn D, chín sớm d .Hãy xác định số lượng giao tử của các cá thể có kiểu gen AaBbdd và aaBbdd

31. I was _____ the impression that you had left. A. under B. below C. in D. on 32. There isn‟t any sugar left, I am afraid. You‟ll have to _____. A. manage it B. put up with C. do without D. make for 33. Losing my job was a great shock, but I think I am _____ it. A. seeing to B. putting up with C. standing for D. getting over 34. Owning a car means you don‟t have to depend on public transport and _____ you feel more independent. A. nevertheless B. since C. as a result D. for example 35. Training is given so no previous _____ of catering is required for this job. A. application B. vacancy C. qualification D. experience 36. Marina is so _____ - sometimes she‟s really happy and then a few hours later she refuses to speak to me. A. unstable B. bossy C. changeable D. moody 37. When they heard their train was due to come in on a different _____ all the commuters dashed over to it. A. board B. escalator C. railway D. platform 38. There‟s a major junction controlled by traffic _____ and that‟s where you turn left. A. bypasses B. crossroads C. lights D. roundabouts 39. I like the way my sister has designed her flat – it‟s really _____. A. delicious B. tasteful C. tasty D. fresh 40. There was a good _____ on the television last night about polar bear. A. drama B. series C. soap opera D. documentary

Tìm giá trị nhỏ nhất (lớn nhất) của biểu thức: a) x² -2x + 10 b) x² - x + 1 c) 2x - x² + 5 d) 3x - x² e) x² + 4y² - 2x + 4y + 5 f) x² - x + y² + y - 2

Read the following passage and choose the best answer (A, B, C or D) to each question. A geyser is the result of underground water under the combined conditions of high temperatures and increased pressure beneath the surface of the Earth. Since temperature rises about 1°F for every sixty feet under the Earth surface, and pressure increases with depth, water that seeps down in cracks and fissures until it reaches very hot rocks in the Earth's interior becomes heated to temperature of approximately 290°F.Water under pressure can remain liquid at temperatures above its normal boiling point, but in a geyser, the weight of the water nearer the surface exerts so much pressure on the deeper water that the water at the bottom of the geyser reaches much higher temperatures than does the water at the top of the geyser. As the deep water becomes hotter and consequently lighter, it suddenly rises to the surface and shoots out of the surface in the form of steam and hot water. In turn, the explosion agitates all the water in the geyser reservoir, creating further explosions. Immediately afterward, the water again flows into the underground reservoir, heating begins and the process repeats itself. In order to function, then, a geyser must have a source of heat, a reservoir where water can be stored until the temperature rises to an unstable point, an opening through which the hot water and steam can escape, and underground channels for resupplying water after an eruption. Favourable conditions for geysers exist in regions of geologically recent volcanic activity, especially in areas of more than average precipitation. For the most part, geysers are located in three regions of the world: New Zealand, Iceland, and the Yellow National Park area of the United States. The most famous geyser in the world is Old Faithful in Yellowstone Park. Old Faithful erupts every hour, rising to a height of 125 to 170 feet and expelling more than ten thousand gallons during each eruption. Old Faithful earns its name because, unlike most geysers, it has never failed to erupt on schedule even once in eighty years of observation. 1. Which of the following is the main topic of the passage? A. The Old Faithful geyser in Yellowstone National Park B. The nature of geysers C. The ratio of temperature to pressure in underground water D. Regions of geologically recent volcanic activity 2. In order for a geyser to erupt, _____. A. hot rocks must rise to the surface of the Earth B. water must flow underground C. it must be a warm day D. the Earth must not be rugged or broken 3. The word „it‟ in line 4 refers to _____. A. water B. depth C. pressure D. surface 4. As depth increases _____. A. pressure increases but temperature does not B. temperature increases but pressure does not C. both pressure and temperature increase D. neither pressure nor temperature increases 5. Why does the author mention New Zealand and Iceland in paragraph 4? A. To compare areas of high volcanic activity. B. To describe the Yellowstone National Park. C. To provide examples of areas where geysers are located. D. To name the two regions where all geysers are found. 6. How often does Old Faithful erupt? A. Every 10 minutes B. Every 60 minutes. C. Every 125 minutes. D. Every 170 minutes. 7. The word „expelling‟ in paragraph 4 is closest in meaning to _____. A. heating B. discharging C. supplying D. wasting 8. What does the author mean by the statement: “Old Faithful earns its name because, unlike most geysers, it has never failed to erupt on schedule even once in eighty years of observation.”? A. Old Faithful always erupts on schedule. B. Old Faithful is usually predictable. C. Old Faithful erupts predictably like any other geysers. D. Old Faithful received its name because it has been observed for many years. 9. The word „precipitation’ in paragraph 4 is closest in meaning to _____. A. the amount of steam B. the amount of rain C. humidity D. heat 10. According to the passage, what is required for a geyser to function? A. A source of heat, a place for water to collect, an opening, and underground channels. B. A source of heat, an active volcano nearby and a water reservoir. C. Channels in the Earth, heat and heavy rainfall and water underground. D. Volcanic activity, underground channels and steam.

Cho hỏi lớp 6 môn học TCV là gì ak????

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