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nqn105205
2 năm trước
để có 1 dung dịch chứa 16g NaOH,cần phải lấy bao nhiêu gam Na2O cho tác dụng với H2O?
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I. Find the word which has a different stress pattern from the others. 1. A. geography B. ideology C. topography D. voluntary 2. A. Japanese B. Portuguese C. pioneer D. examinee 3. A. oceanic B. botanical C. identical D. romantic 4. A. natural B. animal C. waterfall D. illegal II. Choose the best answer (A,B,C or D). 1. If an earthquake suddenly............................now, what ....................you do? A. would occur - would B. occurred - would C. will occur - will D. occurs - will 2. The water temperature in streams, rivers, oceans change is the effect of A. radioactive pollution B. thermal pollution C. light pollution D. visual pollution 3. Smoking can.................................heart disease. A. lead to B. create C. causes D. due to 4. People believe that the...........................water has brought cancer to the local residents. A. pollutant B. pollution C. polluted D. polluting III. Put the verbs into the correct forms. 1. If you want to reduce the light, I (turn off).............................some LED bulbs. 2. The housework (do).........................every day. 3. The concert (begin).............................at 7.30 p.m and (last).........................two and a half hour. Don't be late. 4. Before I moved to Florida, I (spend).....................................three days visiting Texas.

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