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第1题

As () announced in today.s papers, the Shanghai Export Commodities Fair is also open on Sunday
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第2题

lt is useful to be able to predict the extent () which a price change will affect supply and demand.
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第3题

Great as Newton was, many of his ideas () (challenge) today and are being modified by the work ofscientists of our time.
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第4题

--A: () ?B:lt.s on sale for 50 cents a piece. A. Can I help you? B. Are these on sale? C. Are these for sale? D. Wha
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