Electronics are being recycled in record n

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问题:

Electronics are being recycled in record numbers as more states require it and more companies collect and even pay for discarded items, but the gains come with controversy.

Some environmentalists complain that recycling is not keeping pace with electronics sales. Some say e-waste is being dumped in developing countries, where toxic materials such as lead and mercury can leach from landfills into groundwater.

"It is a success story, but we’d like to see it get more successful" to keep up with the electronics boom, says Janette Petersen of the Environmental Protection Agency (EPA). The amount of recycled items more than doubled from 1999 to 2007, the most recent year for which the EPA has figures. But as a percentage of all electronics, it increased less, from 15% to 18%. "The demand for electronics recycling has been growing," partly because of the switch last year to digital TV, says Jennifer Berry of Earth911. corn, a private group that keeps a database of recyclers. Last year, she says 31% of inquiries involved electronics, primarily TVs, batteries and computers.

Public and private efforts are expanding. Vermont became the 21st state last month to enact a law that requires e-waste recycling. Twenty-six companies--including Dell, Hewlett Packard, AT&T and Verizon--have partnered with the EPA on the Plug-In to eCycling program to promote electronics recycling since its launch in 2003. Companies such as Gazelle. corn pay for used gadgets such as iPods, which they resell or recycle. Best Buy and other stores are collecting more e-waste. Target announced last month that it put bins in every store to accept cellphones, MP3 players and ink cartridges.

Jim Puckett of Basel Action Network, a Seattle-based non-profit organization that aims to stop toxic exports, worries that some American companies dump e-waste in Africa to save money. "People are trying to look green, but they’re not telling you where it (waste) is going," he says. "You can’t turn over your TV to just any recycler. " He says it’s better to store an old TV than give it to a recycler that may export it to poor countries.

The Basel Action Network announced its e-Stewards program last month to ensure safe handling of electronics by using only recyclers certified by accredited organizations. It now lists 45 recyclers in 80 locations. Samsung and other companies have signed on. Environmental groups, including the Sierra Club, back it.

What is the main idea of the text()

A. Recycling of electronic items is a "success story"

B. Environmentalists are opposed to recycling electronics

C. Recycling can not keep pace with electronics sales

D. It is unnecessary to recycle electronics

考点:普通考研07理学真核生物的遗传分析、细菌的遗传分析(二)
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作为荧光标记物的荧光素必须具备的条件是()。

A.须具有化学的活性基团,能与蛋白质稳定结合

B.荧光素标记后改变抗体的活性

C.荧光与背景组织色泽相同

D.易淬灭

E.有较宽的激发光谱

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温度控制因为容量滞后较大,所以一般采用PID控制规律。

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一个关系中属性个数为1时,称此关系为______。

A.对应关系

B.单一关系

C.一元关系

D.二元关系

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有一位数学家说:“很难想象一个文理不通、错字连篇的人,能把逻辑严谨的数学内涵表达出来。”著名数学家苏步青说:“我从小打好的语文基础,对我学习其他学科提供了很大的方便。我还觉得学好语文对训练一个人的思维很有帮助,可以使思想更有条理。这些,对我后来学好数学都有很大好处。”人们赞誉苏步青为“数学诗人”。
这段文字表达的是( )。

A.即使文理不通、错字连篇的人,也能把数学内涵表达出来
B.学好语文是学好数学的必备条件
C.数学家用亲身体会,明确地指出了学好语文的重要性
D.赞扬了“数学诗人”苏步青的惊人才华

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