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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  41
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 the underlined word "gravity" in paragraph 1 probably mean?
选项 A、Pull.
B、Extinction.
C、Popularity.
D、Seriousness.
答案D
解析 根据第一段第二句“wildfires have recently destroyed forests across the world…”可知，最近，世界各地的一些地区都遭到了森林大火的破坏，and的后面表示并列或者递进，所以可推断火势越来越严重，gravity意为“严重性”，故选D。
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