单项选择题
| Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20. |
What’ s the talk mainly about
- A．Green house effect.
B．Garbage treatment.
C．Environment protection.
D．Over-packaging problem.
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相关考题
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填空题
What does "runoff" mean -
单项选择题
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. -
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.
