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
A．Bicycles and cars.
B．Building codes.
C．Energy conservation.
D．New housing construction. -
填空题
Noise is America’ s most widespread ______ .
