Câu 20: Dẫn 5,6 lít anken X qua dung dịch brom dư thấy khối lượng bình brom tăng 14 gam. CTPT của anken là: A. C4H8. B. C4H10. C. C5H10.

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X. Rewrite each of the following sentences so that it means the same as the first one, beginning with the givenwords. (2.0pts) 1. Her book is not the same as mine.  Her book ................................................................................................................... 2. It isn’t necessary for students to wear uniforms on Wednesday.  Students don’t ........................................................................................................... 3. She teaches English well.  She is......................................................................................................................... 4. It took us a whole day to look for these old pictures.  We spent .................................................................................................................. 5. What is the distance between your hometown and your school?  How ....................................................................................................................... ? 6. Mr Thanh couldn’t enjoy the meal because of the stomachache.  The stomachache prevented ..................................................................................... 7. He is a slower and more careful driver than I am.  He drives .................................................................................................................. 8. He preferred oranges to durians.  He liked .................................................................................................................... 9. Zidane is among the greatest football players in the world.  One of the ................................................................................................................. 10. Why didn’t you come to class last Monday?  Why were................................................................................................................