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单项选择题

A．Three or four.B．Five or six.C．Seven or eight.D．Twelve……


Questions 11-13 are based on the following passage. You now have 15 seconds to read questions 11-13.
How many solar heat panels do three or four bedroom homes usually need



A．Three or four.
B．Five or six.
C．Seven or eight.
D．Twelve or more.
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填空题How much of all precipitation is runoff

单项选择题22（）

A．kinds
B．species
C．sorts
D．types

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单项选择题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.

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.