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 environments. 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 make the best use of harvested energy, enables sensors to operate reliably in a battery-free environment.

Wireless sensor networks deployed in out 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.

43. By “human intervention” (Paragraph 2), the author refers to _____.

A the reduction of great energy waste in the environment

B the grasping of straightforward opportunities available

C acts like turning off lights when no one is in the room

D the adoption of smart sensing and network technology

44. Batteries are not an ideal energy source for sensor networks because they ____.

A have to be replaced from time to time

B contain metals that pollute the environment

C require automatic recharging

D are difficult and costly to maintain

45. Battery-free wireless sensor networks are made possible by the fact that _____.

A there is energy in the environment to be utilized

B the cost of using them has been drastically reduced

C modern data communication consumes little energy

D their maintenance has been greatly simplified

46. According to the passage, GreenPeak _____.

A is the first company to install wireless sensor networks

B promotes the application of wireless sensor networks

C supplies batteries operating on harvested energy

D benefits handsomely from communication technology

47. The focus of Paragraph 4 is on the _____.

A replacement of batteries in harvesters

B monitoring of energy harvested from the environment

C elimination of batteries in sensor networks

D impact of sensor networks on power supply

48. Wireless sensor networks promise to ____.

A bring businesses high profits

B further develop the sensing technology

C turn motion into a major source of energy

D improve the daily lives of people worldwide

Passage Four

If you haven’t heard or seen anything about Road Rage in the last few month you’ve probably been avoiding the media. There have been countless stories about the new and scary phenomenon, considered a type of aggressive driving. You have more likely encountered aggressive driving and/or Road Rage recently if you drive at all.