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Tuyentran0201
1 năm trước
Cho các chất sau: Na2CO3, NaOH, Cu(OH)2, H¬2SO4, MgCl2. Chất nào có thế tác dụng với: a) Dung dịch Axit clohiđric b) Nước vôi trong. c) Dung dịch Bari clorua. Viết các PTHH xảy ra?
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VI. Read the following passage and choose the correct answer (A, B, C or D) to complete the passage.                 When man first appeared on Earth, his greatest source of power was his own strength. As he grew wiser, he learnt to make animals supply power for him. Then many centuries later, he discovered that wind and water were even better power sources than animals. Still later, he found that power from steam, coal, and oil was often even better than these.                 In the latest search for improved living, physicists – scientists who study energy and matter – have been led to the study of the atom. The physicists have found that atomic energy can do such things as supplying electricity, to cities, blasting tunnels through the mountains, running ships and submarines and even providing for space flights.                 Finding ways to make the atom work for us is a new science. It just started in the twentieth century. Scientists are still learning more about the atom so that it can be used to help mankind better.    1. Which of the following is the main topic of paragraph 1?                 A. Power from animals                                                B. Power from wind and water                 C. Power from steam, coal and oil                          D. Sources of power over the centuries 2. All of the following words are nearest in meaning to “power” EXCEPT…………..                 A. control        B. strength                          C. energy                            D. force  3. The word “latest” in the paragraph 2 could best be replaced by………………..                 A. very late                         B. nearest                            C. most recent                  D. final 4. Which of the following is NOT true about atomic energy? A. It is power from atom                                                                B. It was discovered by physicists C. It was as powerful as any earlier form of power.     D. It has improved humans’ life on earth. 5. Scientists believe that………………….. A. life on earth can’t be improved without the atom. B. power from the atom is the best form of power. C. they have known all about the atom        D. it is possible to make better use of atomic energy  VII. Fill in each numbered space with ONE appropriate word.          A postman’s job is sometimes difficult, (1)_____________ it is also meaningful and rewarding. Every morning (2)_____________ Sundays and holidays, he (3)_____________ at the post office (4)_____________ to get the mail. Carrying his mail (5)_____________on his shoulder, he makes his (6)_____________ from building to building. On cold days, as well as (7)_____________ days, on rainy days as well as (8)_____________ days he brings good and bad (9)_____________, bills, notices and advertisement to residents of the area. With his good memory, he is even (10)_____________ to deliver wrong address letters to their owners.

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