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2 năm trước
Nguyên tử Sắt có điẹn tích hạt nhân là 26+. Trong nguyên tử số hạt mang điẹn nhiều hơn số hạt không mang là 22. Hãy xác định số p,n,e của nguyên tử Sắt
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VII.Read the passage below and answer the questions: We can develop alternative sources of energy, and unless we try we’ll never succeed. Instead of burning fossil fuels we should be concentrating on more economic uses of electricity, because electricity can be produced from any sources of energy. If we didn’t waste so much energy, our resources would last longer. We can save more energy by conservation than we can produce for the same money. Unless we do research on solar energy, wind power, tidal power, hydroelectric plants… our fossil fuels will run out and we’ll all freeze or starve to dealth. Many countries are spending much more time and money on research because the energy from the sun, the waves and the winds last forever. We really won’t survive unless we start working on cleaner and safer sources of energy. 1.. Can electricity be produced from any sources of energy? Ä ………………………………………………………………. 2.. What would happen if we didn’t waste so much energy? Ä ………………………………………………………………. 3.. Why are many countries spending much more time and money doing research on energy from the sun, the waves and the wind? Ä ………………………………………………………………. 4. What will happen unless we start working on cleaner and safer sources of energy? Ä ……………………………………………………………….

Part 4. Complete the second sentence so that it means the same as the first one, using the word given. You must use between three and eight words, including the word given. Be careful, because inversion may not be required in every sentence. 1 It isn’t worth considering his suggestion for a moment. Not for one moment_________________________ _ consideration. giving 2 He was so disgusted at the way she behaved that he refused to speak to her. Such ______________________________he refused to speak to her. her 3 Adele tries hard, but she doesn’t get anywhere. However______________________________ nowhere. hard 4 The volunteers’ efforts to avert the catastrophe were unsuccessful, In vain______________________________ avert the catastrophe. attempt 5 I was never shown how to operate the machine, At no time______________________________ the machine work. ever 6 The firm had never celebrated anything so lavishly before, Never______________________________ laid on by the firm. such 7 It wasn’t until last week that the minister admitted he was wrong, Only last week_______________________________ of judgement. error 8 Tick the box if you wish to take advantage of the offer, Should______________________________ tick in the box. accept 9 We may have to reject applications in a few cases, In a few cases, applications______________________________ down. be 10 Invitations were sent out as soon as the date was chosen. Hardly______________________________ invitations were sent out. been 11 In order to stay open, the charity shop needs at least four helpers, No fewer_______________________________ the charity shop to stay open. enable 12 If his father hadn’t advised him against it, he might have become a record producer. for Had it not_______________________________ a record producer now. 13 The employees insisted on being given a full bonus, Nothing but______________________________ the employees. satisfy 14 This computer data is strictly confidential, Under no circumstances______________________________ to anyone. revealed

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