Cho sơ đồ phản ứng CaCO3 + 2HCl → CaCl2 + CO2 + H2O -Tỉ lệ số phân tử CaCO3 : số phân tử HCl tham gia phản ứng là: A. 1; 1. B. 1; 2. C. 1; 3. D.2; 1.

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Benefit of living in the countryside. While many people prefer city life, a lot of people want to send their life in a rural area. The countryside are often(1)_________than the city because there are not as many factories and traffic as in big cities. The country folk can be (2) _________and they often live(3) _________than city dwellers. Besides, life in the countryside is(4) _________and peaceful because the crime rate is much(5) _________. The rural areas are(6) _________populated than the urban area but the neighbors are(7) _________and more helpful. Life in the countryside is(8) _________for old people than the energetic youngsters 1. * 1 điểm A.less polluted B.more polluted C.less pollutedly D.more pollutedly The country folk can be (2) _________and they often live(3) _________than city dwellers. * 1 điểm 2. A.more healthy B.healthier C.more healthily D.helthily. The country folk can be (2) _________and they often live(3) _________than city dwellers. * 1 điểm 3.A.longly B.longer C.shortly D.shorter Besides, life in the countryside is(4) _________and peaceful because the crime rate is much(5) _________. * 1 điểm 4.A.more simple B.simpler C.simply D.more simply Besides, life in the countryside is(4) _________and peaceful because the crime rate is much(5) _________. 1 điểm 5.A.higher B.highly C.lower D.lowly The rural areas are(6) _________populated than the urban area but the neighbors are(7) _________and more helpful. Life in the countryside is(8) _________for old people than the energetic youngsters. * 1 điểm 6. A.more densely B.more dense C.less D.less dense The rural areas are(6) _________populated than the urban area but the neighbors are(7) _________and more helpful. Life in the countryside is(8) _________for old people than the energetic youngsters. * 1 điểm 7 .A.more friendly B.friendlier C.friendly D.less friendly The rural areas are(6) _________populated than the urban area but the neighbors are(7) _________and more helpful. Life in the countryside is(8) _________for old people than the energetic youngsters. * 1 điểm 8. A.more suitable B.more suitbly C.less suitably D.suitably.