In 1993, New York State ordered stores to

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In 1993, New York State ordered stores to charge a deposit on beverage (饮料) containers. Within a year, consumers had returned millions of aluminum cans and glass and plastic bottles. Plenty of companies were eager to accept the aluminum and glass as raw materials for new products, but because few could figure out what to do with the plastic, much of it wound up buried in landfills (垃圾填埋场). The problem was not limited to New York. Unfortunately, there were too few uses for second-hand plastic.

Today, one out of five plastic soda bottles is recycled (回收利用) in the United States. The reason for the change is that now there are dozens of companies across the country buying discarded plastic soda bottles and turning them into fence posts, paint brushes, etc.

As the New York experience shows, recycling involves more than simply separating valuable materials from the rest of the rubbish. A discard remains a discard until somebody figures out how to give it a second life—and until economic arrangements exist to give that second life value. Without adequate markets to absorb materials collected for recycling, throwaways actually depress prices for used materials.

Shrinking landfill space, and rising costs for burying and burning rubbish are forcing local governments to look more closely at recycling. In many areas, the East Coast especially, recycling is already the least expensive waste-management option. For every ton of waste recycled, a city avoids paying for its disposal, which, in parts of New York, amounts to savings of more than $100 per ton. Recycling also stimulates the local economy by creating jobs and trims the pollution control and energy costs of industries that make recycled products by giving them a more refined raw material.

Recycling has become the first choice for the disposal of rubbish because ().

A. local governments find it easy to manage

B. recycling has great appeal for the jobless

C. recycling causes little pollution

D. other methods are more expensive

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有关季风水田农业区水稻种植业的特点叙述正确的是(  )

A.机械化水平高

B.单位面积产量高,商品率高

C.小农经营

D.水利工程量较小

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腔静脉窦内有()。

A.上腔静脉口、下腔静脉口和右房室口

B.上腔静脉口、右房室口和冠状窦口

C.下腔静脉口、右房室口和冠状窦口

D.上腔静脉口、下腔静脉口和冠状窦口

E.卵圆窝、右房室口和冠状窦口

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肝藏血功能正常的表现是()

A.贮藏血液

B.调节血流量

C.防止出血

D.固摄血液

E.推动血行

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通过观察与()连接端口的指示灯是否发亮,可以判断网络连接是否正常。

A、CPU(或Switch)

B、集成电路芯片

C、HUB(或Switch)

D、集成电路板

题型:单项选择题

无限长线声源10m处噪声级为82dB,在自由空间传播约至()处噪声级可衰减为70dB。

A.40m

B.80m

C.120m

D.160m

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