单项选择题

A．Supermarkets provide cheaper foods.
B．There is less delay in choosing in supermarkets.
C．Food and meat are more clean and more tasty.
D．Air-conditioning is at different temperatur
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单项选择题
A．Average tuition costs increased by 9 percent.B．Average tuition costs increased by 15 percent.C．Average tuition costs increased by 90 percent.D．Average tuition costs increased by 150 percent.
A．Average tuition costs increased by 9 percent.
B．Average tuition costs increased by 15 percent.
C．Average tuition costs increased by 90 percent.
D．Average tuition costs increased by 150 percent.
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