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bạc có 2 đồng vị trong tự nhiên là 107Ag chiếm 51,839% số nguyên tử. tính số khối của lượng đồng vị còn lại biết trong AgCl bạc chiếm 75,254%về khối lượng
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1. Fruit tastes good _________ it’s healthy for your body. a. but b. and c. so d. or 2. I want to buy a new jacket, _________ I don’t have enough money. a. and b. so c. but d. because 3. Linda is going to make a cake, _________ she needs some eggs and flour. a. so b. but c. and d. or 4. We went for a walk _________ it was raining heavily. a. because b. although c. therefore d. however 5. We can go to the pool _________ we can go horse-riding, whichever you prefer? a. or b. but c. and d. so 6. John likes funny movies _________ he doesn’t like scary movies. a. and b. or c. so d. but 7. I’d like to see that Korean band _________ their music is pretty cool. a. although b. so c. because d. but 8. I still cry at the end _________ I’ve seen this movie several times. a. and b. although c. because d. so 9. You must hurry _________ you will miss your train. a. so b. but c. and d. or 10. His chocolate was too hot, _________ he put some cold milk in it. a. so b. but c. because d. although Choose the word whose underlined part is pronounced differently from the others. 11. a. theater b. thank c. there d. thirty 12. a. game b. animal c. channel d. national 13. a. watch b. channel c. children d. schedule 14. a. programme b. show c. popular d. home 15. a. newsreader b. weather c. week d. leave

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