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tosannguyen10012005
2 năm trước
Tại sao khi bỏ quả trứng vào dung dịch axit axectic quả trứng nổi lên trên và xung quanh có những bọt khí nào thoát ra ( trong khi đó bọt khí sinh ra là bọt khí gì ) mik đng cần gấp nha
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A. READING: Read. Then do the task below At school we often have four classes in the morning and three lessons in the afternoon. After each class we have a five- minute break. It's time for recess. After a hard lesson, this time is very important. We are all happy and excited. We can meet our friends and have fun. During the recess, the yard and classroom are very noisy. Many students are sitting and chatting. Some eat or drink. Some play games as blind man's bluff or catch. Some girls skip rope, some boys play marbles or swap cards. These activities only stop when the bell rings. Then all the students go in to their classrooms and begin new lessons. Answer True (T) or False (F) ____ 1. At school, we have three classes in the morning and four in the afternoon. ____ 2. We often have a five - minute break after each lesson. ____ 3. During the recess, the yard and class room aren't very noisy. ____ 4. All the students play games as blind man's bluff and catch at recess. ____ 5. The activities at recess will stop when the bell rings. ____ 6. All the students go home after the recess.

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