单项选择题

Questions 11-13 are based on the following passage. You now have 15 seconds to read questions 11-13.
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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A．kinds
B．species
C．sorts
D．types

Questions 11-13 are based on the following passage. You now have 15 seconds to read questions 11-13. How many solar heat panels do three or four bedroom homes usually need 您的浏览器不支持 audio 元素。