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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

填空题Noise can produce serious ______ stress.

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.

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 ______ .

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.