单项选择题

Questions 19-22 are based on the following dialogue:
How many solar heat panels do three or four-bedroom homes usually need

A．Three or four.
B．Five or six.
C．Seven or eight.
D．Twelve or more.

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单项选择题

单项选择题

Questions 19-22 are based on the following dialogue: How many solar heat panels do three or four-bedroom homes usually need 您的浏览器不支持 audio 元素。