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
- A．They look like sandwiches.
B．They can heat but not cool homes.
C．They cost about ＄300 each.
D．They are placed on rooftops.
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相关考题
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单项选择题
Why is insulation required in new houses
A．To limit discussion on heating bills.
B．To prevent heat loss.
C．To determine temperature in homes.
D．To convert homes to electric heat. -
单项选择题
21（）
A．require
B．need
C．want
D．lack -
填空题
What does "runoff" mean
