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How much of all precipitation is runoff

【参考答案】

About 30%
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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.
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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.
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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.

单项选择题What’ s the talk mainly about

A．Green house effect.
B．Garbage treatment.
C．Environment protection.
D．Over-packaging problem.