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单项选择题

A．To avoid direct sunlight.B．To limit space used.C．To k……


Questions 14-16 are based on the following passage. You now have 15 seconds to read questions 14-16.
What is the purpose of building new houses facing north or south



A．To avoid direct sunlight.
B．To limit space used.
C．To keep out the cold.
D．To conform to other houses.
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单项选择题What’s the problem with paper napkins and plastic food wraps

A．They can’ t be recycled though they help people save time on housework.
B．They become trash and therefore are harmful to the environment.
C．They add cost to the product and thus make it more expensive.
D．Sometimes they are not strong enough to hold the purchase.

单项选择题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.

填空题What is the passage mainly about

单项选择题21（）

A．require
B．need
C．want
D．lack

填空题Noise constitutes a real and present danger to ______ .