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  3. A cheap printed sensor (传感器) could transmit wildfire warnings. Wildfires have recently destroyed the forests across the world, a

A cheap printed sensor (传感器) could transmit wildfire warnings. Wildfires have recently destroyed the forests across the world, a

admin2022-07-24  54
问题     A cheap printed sensor (传感器) could transmit wildfire warnings. Wildfires have recently destroyed the forests across the world, and their gravity is increasing. Hoping to reduce harm, researchers led by Yapei Wang, a Chinese chemist of Renmin University, say they have developed an inexpensive sensor to detect (监测)  such fires earlier with less effort.
    Current detection methods rely heavily on human watchfulness, which can delay an effective response. Most wildfires are reported by the general public, and other alarms come from routine foot patrols and watchtower observers. Passing planes and satellites also occasionally spot something, but "the fire first appears on the ground, " Wang says. "When you see the fire from the sky, it is too late. "
    The team says its new sensor can be placed near tree trunks’ bases and send a wireless signal to a nearby receiver if there is a quick temperature increase. That heat also powers the sensor itself, without replacing batteries. The team printed the substances onto ordinary paper to create a sensor for just $0.40.
    But improving coordination among the different companies involved in firefighting is even more important to deal with, says Graham Kent, an earthquake expert at the University of Nevada, Reno, who was not part of the study. Kent is director of ALERT Wildfire, a network that uses cameras and crowd sourcing to watch for fires in California, Nevada and Oregon. "The whole way that you respond to a fire until it’s put out is like a ballet, " he says. "You’d have to choreograph (设计) it just so, with resources accurately used at the right time and place in the right order from detection to confirmation to assignment to extinguishment (熄灭). Fire detection is just step one. "
    Wang says his team’s next steps are to extend the device’s signal range beyond the current 100 meters, which can limit practical use, and to develop a protective shield (防护罩) for it. The transmitter’ s effectiveness,  he notes,  will also need to be examined in the field ahead.
What do we know about the sensor?
选项 A、Its price remains high.
B、Its batteries are replaceable.
C、It can detect fires earlier and easier.
D、It can reduce firefighters’ pain.
答案C
解析 根据第二段第一句…Current detection methods rely heavily on human watchfulness, which can delay an effective response．”可知，目前的检测方法严重依赖于人类的警惕，这可能会延迟有效的反应。结合第三段第一句“The team says its new sensor can be placed near tree trunks’bases and send a wireless signal to a near by receiver if there is a dramatic temperature increase．”可知，研究小组表示，他们的新传感器可以放置在树干根部附近，如果温度急剧上升，就会向附近的接收器发送无线信号。综上所述，目前的检测方法很大程度上依赖人的观察力，这会延迟有效的反应。这种新型传感器可以向附近的接收器发送无线信号，可以更快、更早地检测出火灾．故选C。
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