问题 单项选择题

下列各句中没有语病、句意明确的一句是 _______.

A.他那家公司陷入了前所未有的困境,几番拼死挣扎,还是没能坚持下去

B.为彻底杜绝随地吐痰这种不良现象不再发生,有关部门加大了管理力度

C.据科学家统计,蜜蜂每酿造0.5千克蜜,大约要采集50万朵的花粉

D.由于人口过于集中造成了不少城市的供应、就业、住宅、水电等问题日益严重

答案

参考答案:A

解析:B句“彻底杜绝”与“不再发生”重复;C句“50万朵’’中缺少中心语“花”; D句中滥加“由于"而导致该词组的主语残缺,另“造成了"中的“了”改为“的”.

选择题
单项选择题

Current Group, a Germantown-based technology firm, has taken over an ordinary looking house in Bethesda and turned it into a laboratory for smart-grid technology, the system the company believes will bring the nation’s electricity grids into the digital age.
In the front yard stands a utility pole hooked up to a special transformer that connects the power lines to high-speed Internet. Hundreds of sensors attached to the lines monitor how power flows through the home. That information is then sent back to the utility company.
The process lets a utility more efficiently manage the distribution of electricity by allowing two-way communication between consumers and energy suppliers via the broadband network on the power lines. Based on data they receive from hundreds of homes, utilities can monitor usage and adjust output and pricing in response to demand. Consumers can be rewarded with reduced rates by cutting back on consumption during peak periods. And computerized substations can talk to each other so overloaded circuits hand off electricity to those that have not fully loaded, helping to prevent blackouts.
Some utility companies have launched initiatives to give consumers data about their energy consumption habits in an effort to lower energy bills. Smart-grid technology takes such programs further by automating electricity distribution, which would make grids more reliable and efficient.
By partnering with utilities, the company hopes to tap into $4.5 billion in stimulus grants intended to encourage smart-grid development. When he announced the funding, President Obama pointed to a project in Boulder, Colo. , as an example of a successful smart-grid experiment. Current is one of the companies working on the project.
Current’s chief executive Tom Casey believes the technology will help utility companies better distribute electricity produced by renewable resources, such as solar panels or wind farms. " A smart grid’s system can be paired up with the renewable resources so that when the renewable source is varying, the overall load can be varied as well, " Casey told the House Select Committee on Energy Independence and Global Warming. " This will reduce or eliminate the need for backup coal or gas-based power generation plants. \

For smart-grid technology to work, which of the following is a must

A.The front yard of a house with a tall wooden pole.

B.A huge hook that can connect power lines together.

C.High-speed Internet access and Internet services.

D.Many monitors through which power flowing can be seen.