[单项选择]Regional and local telephone companies around the nation are beginning to offer customers an electronic operator system that allows customers to choose to make some operator-assisted calls through an electronic operator. Nevertheless, the number of human operators on staff will not be reduced in the foreseeable future.
Each of the following statements, if true, helps explain why the number of human operators is not being reduced EXCEPT （）.
A. Demand for operator-assisted calls is increasing dramatically.
B. The new electronic operator system, though it has been tested, is expected to require significant adjustments before it can become fully operational.
C. The operators union would be quick to strike the companies involved if operators were dismissed during the current contract period.
D. In one regional trial of the electronic system, virtually all consumers, given a choice, preferred a human operator to an electronic one.
E. The new electronic operator system will complete operator-assisted calls twice as fast as human operator can.

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[单项选择]

Experts Call for Local and Regional Control of Sites for Radioactive Waste

The withdrawal of Nevada’s Yucca Mountain as a potential nuclear waste repository has reopened the debate over how and where to dispose of spent nuclear fuel and high-level nuclear waste. In an article in the July 10 issue of Science, University of Michigan geologist Rodney Ewing and Princeton University nuclear physicist Frank von Hippel argue that, although federal agencies should set standards and issue licenses for the approval of nuclear facilities, local communities and states should have the final approval on the sitting of these facilities. The authors propose the development of multiple sites that would service the regions where nuclear reactors are located.
"The main goal..., should be to provide the United States with multiple process that requires acceptance by host communities and states," the authors write.
Ewing and yon Hippel also analyze
A. Retirement.
B. Canceling.
C. Replaced.
D. Disposal.

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A local telephone directory is sometimes called the White Pages. This directory provides an alphabetic listing of names and telephone numbers and other telephone reference information. The front pages usually contain information about area codes; billing; customer service; directory ass/stance(帮助); local, long-distance, and international calls; lime zones; rates; emergency numbers; and other items relating to telephone use.
The next section of the telephone directory typically contains the residence listings, or entries, of community residents. The third section contains business listings, or entries, of local businesses and organizations. In some less populated(人口不密集的) or rural areas, the residence and business listings may be combined in one section.
Some local directories contain listings of local, state and federal(联邦的) government offices and agencies. These listings might be united into the business listing section, or they may be in a separate section of the

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