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第1题

The advantages and disadvantages of a large population have long been a subject of discussion among economists. It has b
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第2题

For a clearer picture of what the student knows, most teachers use another kind of examination in addition to objective
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第3题

For the first nineteen months of her life, Helen Keller was like other pretty, happy babies in every way. Then a sudden
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第4题

Tourism has become a very big business．For Spain，Italy and Greece，it is the largest (1) of foreign exchange，and even f
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