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cho E=2-x/x-3 tìm x thuộc N để E thộc Z
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The world is divided into two main parts: one part is poor and the (51)…………… is rich. The poor countries are called ‘the developing countries’. The big problem that they have to (52) ………. is lack of food and medical care. A lot of people do not have enough food to eat and medicine to cure illnesses. In some parts, children are even starving. The land of those countries is too poor to cultivate anything on. They do not know (53)………..new farming Methods as well as inventions and discoveries of science and technology. (54)…………, they do not have enough money to do it. They certainly need help from (55)………………..countries. 51. A. another B. other C. others D. one 52. A. meet B. deal C. encounter D. cope 53. A. applying B. to apply C. how to apply D. how applying 54. A. However B. Moreover C. Therefore D. As a result 55. A. rich B. the rich C. another rich D. a rich

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