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emnhodangyeu
2 năm trước
Có 1 viên đá vôi nhỏ, 1 ống nghiệm đựng axit clohidric và 1 cân nhỏ với độ chính xác cao. Làm thế nào để xác định được khối lượng khí cacbonic thoát ra khi cho viên đá vôi vào ống nghiệm đựng axit
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I. Fill in the blanks with one suitable article “a”, “an”, “the” or “Ø” (no article): 1. She asked me for _____________ information about the meeting. 2. A boy and a girl are arguing over there. I think I know _________ boy. 3. Yesterday my mother had _________ terrible headache. 4. Peter is __________ most hard-working student I’ve ever known. 5. It is cold because ___________ heating system is broken. 6. Did you buy _______ pair of shoes last week? 7. My brother often has ____________eggs for breakfast. 8. You can see __________ moon clearly in the Mid-Autumn festival. 9. + 15 + 16. James offered me _______ cup of coffee and _________ piece of cake. __________ cake is delicious. “the” or “Ø” (no article): 1. She asked me for _____________ information about the meeting. 2. A boy and a girl are arguing over there. I think I know _________ boy. 3. Yesterday my mother had _________ terrible headache. 4. Peter is __________ most hard-working student I’ve ever known. 5. It is cold because ___________ heating system is broken. 6. Did you buy _______ pair of shoes last week? 7. My brother often has ____________eggs for breakfast. 8. You can see __________ moon clearly in the Mid-Autumn festival. 9. + 15 + 16. James offered me _______ cup of coffee and _________ piece of cake. __________ cake is delicious.

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