单项选择题
| Questions 11-13 are based on the following passage. You now have 15 seconds to read questions 11-13. |
Which is not true about solar heat collector panels
单项选择题 21（）
单项选择题 Why is insulation required in new houses
单项选择题 What’ s the talk mainly about
填空题 What characteristics can be of a flood
单项选择题 What do we learn about the use of solar energy in the USA
单项选择题 What is the main topic of the lecture
填空题 What is the passage mainly about
填空题 What does "runoff" mean
填空题 Noise constitutes a real and present danger to ______ .
填空题 Noise is America’ s most widespread ______ .