单项选择题

A．They can’ t be recycled though they help people save ……

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20.

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.

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热门试题

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.

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.

填空题What characteristics can be of a flood

单项选择题What do we learn about the use of solar energy in the USA

A．It is very well established.
B．It is relatively new.
C．It is found in one million homes.
D．It is being rapidly expanded.

单项选择题What is the main topic of the lecture

A．Bicycles and cars.
B．Building codes.
C．Energy conservation.
D．New housing construction.

填空题Noise is America’ s most widespread ______ .