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  3. Many are aware of the tremendous waste of energy in our environment, but fail to take advantage of straightforward opportunities

Many are aware of the tremendous waste of energy in our environment, but fail to take advantage of straightforward opportunities

admin2012-01-27  94
问题     Many are aware of the tremendous waste of energy in our environment, but fail to take advantage of straightforward opportunities to conserve that energy. For example, everyone knows that lights should be switched off when no one is in an office. Similarly, when employees are not using a meeting room, there is no need to regulate temperature.
    Fortunately, one need not rely on human intervention to conserve energy. With the help of smart sensing and network technology, energy conservation processes such as turning off lights and adjusting temperature can be readily automated. Ultimately, this technology will enable consumers and plant managers to better identify wasteful energy use and institute procedures that lead to smarter and more efficient homes, buildings and industrial plants.
    Until now, wires and cables for power and connectivity have limited the widespread adoption of sensor (传感器) networks by making them difficult and expensive to install and maintain. Battery-powered wireless networks can simplify installation and reduce cost. But their high power consumption and the corresponding need for regular battery replacement has made wireless networks difficult and costly to maintain. Nobody wants to replace hundreds or thousands of window sensor batteries in a large building on a regular basis.
    The promise of wireless sensor networks can only be fully realized when the wiring for both the data communication and the power supply is eliminated. Doing so requires a true battery-free wireless solution, one that can utilize energy harvested directly from the environment.
    To facilitate the widespread deployment of wireless sensor networks, GreenPeak has developed an ultra-low-power communication technology that can utilize environmental energy sources such as light, motion and vibration. This technology, employing on-board power management circuits and computer software to monitor energy harvesters and optimize (充分利用) the use of harvested energy, enables sensors to operate reliably in a battery-free environment.
    Wireless sensor networks deployed in our offices and homes will have an enormous impact on our daily lives, helping to build a smarter world in which energy is recycled and fully utilized.    These wireless platforms, equipped with advanced sensing capability, will enable us to better control our lives, homes and environment, creating a truly connected world that enables people worldwide to live in a more comfortable, safer, and cleaner environment.
Battery-free wireless sensor networks are made possible by the fact that______.
选项 A、their maintenance has been greatly simplified
B、the cost of using them has been drastically reduced
C、there is energy in the environment to be utilized
D、modern data communication consumes little energy
答案C
解析 根据题干中的Battery—free将本题出处定位到第4段末句。该句提到，Doing so就需要一个真正的无需电池的无线电解决方案，那就是能够利用直接从环境中获得的能量。Doing so指的是该段首句提到的消除用于数据通信和电源供应的电线，而这样做的目的是使wireless sensor networks成为现实。由此可知，无需电池的无线传感器网络成为现实的前提是环境中存在能够被直接利用的能源，故答案为[C]。[A]和[B]在文中均未提及，故排除。文中提到消除用于data communication的wiring，而非data communication consumes little energy，故排除[D]。
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