单项选择题

Questions 11-13 are based on the following passage. You now have 15 seconds to read questions 11-13.
What do we learn about the use of solar energy in the USA

A．It is very well established.
B．It is relatively new.
C．It is found in one million homes.
D．It is being rapidly expanded.

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单项选择题What is the main topic of the lecture

Questions 11-13 are based on the following passage. You now have 15 seconds to read questions 11-13. What do we learn about the use of solar energy in the USA 您的浏览器不支持 audio 元素。