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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  109
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 does Kent mean in paragraph 4?
选项 A、Firefighting is easy but crucial.
B、Fire detection resources are rich.
C、Putting out a fire is an orderly activity.
D、Technology is the key to extinguishing a fire.
答案C
解析 根据第四段的内容可知，改善消防机构之间的协调更为关键，人们在正确的时间和地点分配资源，从探测到确认再到调度再到火熄灭。由此可推知，灭火是一项合作而有秩序的活动，故选C。
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