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toanqnno1
2 năm trước
Một bình thông nhau chứa nước biển. Người ta đổ thêm xăng vào nhánh. Mặt thoáng ở 2 nhánh chênh lệch nhau 18mm. Tính độ cao của cột xăng, cho bt trọng lượng riêng của nước biển là 10300N/m3, của xăng là 7000N/m3
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Exercise 2. Choose the best answer to complete the sentences: • There are billions of stars in _____ space. A. a B. an C. X D. the • He tried to park his car but _____ space wasn’t big enough. A. the B. a C. an D. X • Can you turn off _____ television, please? A. X B. a C. an D. the • We had _____ meal in a restaurant. A. a B. X C. The D. an • Thank you. That was ______ very nice lunch. A. a B. an C. the D. X • My daughter plays _____ piano very well. A. the B. a C. X D. an • Jill went to ______ hospital to see her friend. A. x B. the C. a D. an • Mrs Lan went to ______ school to meet her son’s daughter. A. x B. the C. a D. an • We visited _______ two years ago. A. Canada and the United States B. the Canada and the United States C. the Canada and United States D. Canada and United States • Are you going away next week? No, _______ week after next. A. a B. the C. some D. X • We haven’t been to ______ for years. A. cinema B. the cinema C. a cinema D. any cinema • It took us quite a long time to get here. It was ______ journey. A. three hour B. a three- hours C. a three- hour D. three- hours • I can’t work here. There’s so much ______. A. noise B. noises C. the noise D. a noise • I’ve seen ______ good films recently. A. a B. the C. some D. an • I often watch ______ television for two hours every night. A. some B. the C. any D. X • The injured man was taken to _____. A. hospital B. any hospital C. the hospital D. hospitals • She went out without _____ money. A. any B. an C. a D. x • Did _______ police find ______ person who stole your bicycle? A. a /a B. the / the C. a / the D. the / a 19. Can anyone give me .......................... hand, please because I have just fallen over? A. a B. an C. the D. X 20. I don’t know what to do. It’s ................................ problem. A. quite difficult B. a quite difficult C. quite a difficult D. the quite difficult 21. I have left my book in .......................... kitchen and I would like you to get it for me. A. a B. an C. the D. X 22. Please meet me at the train station in ............................ hour from now. A. a B. an C. the D. X 23. They had ____ food and ____ warm homes for the winter, so they wanted to say thank you to their native American friends. A. a - a B. x - x C. a - the D. the - a 24. People from ____ cultures bring language skills, new ways of thinking, and creative solutions to difficult problems. A. diversify B. diversification C. diverse D. diversity 25. No one knows the real origins of the Chinese ___ representing the cycles of the lunar year. A. horoscope B. cycle C. stars D. space

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