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Questions 19-22 are based on the following dialogue: Which is not true about solar heat collector panels

A．They look like sandwiches.
B．They can heat but not cool homes.
C．They cost about ＄ 300 each.
D．They are placed on rooftops.

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单项选择题

单项选择题

Questions 19-22 are based on the following dialogue: Which is not true about solar heat collector panels 您的浏览器不支持 audio 元素。