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Academic posters could be an（）way of communicating concisely，visually and attractively.

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effectiveAcademic posters could be an effective way of commu......

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Suppose that 50 ice cream cones are demanded at a particular price.If the price of ice cream cones rises from that price by 4 percent，the number of ice cream cones demanded falls to 46.Using the midpoint approach to calculate the price elasticity of demand，it follows that the（）

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