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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  60
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.
Who is the author’s intended audience?
选项 A、Working women who have no time for cooking.
B、Husbands and children of working women.
C、Working women who must travel on their own.
D、Hotel personnel who must attend to working women.
答案C
解析 根据文章第一段第一句“As more women in the United States move up the professional ladder，more are finding it necessary to make business trips alone．”可知，随着越来越多的美国女性走上职业道路，越来越多的人发现有必要独自出差，结合下文所述，本文写作对象应是出差的职业女性。因此选C。
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