专题10 阅读理解之记叙文10篇（名校最新期中真题）-2023-2024学年九年级英语上学期期中复习查缺补漏冲刺满分（仁爱科普版）

仁爱版九年级上学期期中复习 查缺补漏冲刺满分 (名校最新期中真题) 专题10 阅读理解之记叙文10篇 （2022春·福建福州·九年级福州三牧中学校考期中）Believe it or not, one-sixth of the world’s population depends on the snow that melts on mountains for its fresh water. That is more than one billion people! But we don’t know how much water is actually locked up in the world’s snowy mountains. In the past we have just guessed. A NASA-led experiment called SnowEx is trying to find a real answer by using sensors (感应器) to monitor snow from satellites. Last month, five SnowEX aircrafts took 10 sensors and scanned (扫描) mountains in western Colorado, US. The key to working out how much water will pour out of mountain snow is a measurement called snow water equivalent (SWE，雪水当量). The global average is 30 percent of snow depth, Ed Kim, SnowEx’s lead scientist said. In other words, 25 cm of snow melts down to 8 cm of water. But the mountain snow can be very different, making measurement difficult. There is shallow (浅的) and deep snow. Sometimes snow hides under thick forests. Sometimes snow melts and water will flow through it. No single sensor can deal with all the conditions. That’s why SnowEx is using a combination (组合) of sensors. Each sensor has its strength. Some can see through clouds and darkness. Some see through forests. Some are especially for shallow or deep snow. Together, they will collect data of the snow’s depth, density (密度) and temperature. Scientists will then use a computer to read the data and find a better SWE measurement. “We’ve never before had the opportunity to combine these specific sensors in one experiment,” said Dorothy Hall, a SnowEx scientist. The experiment is very important for understanding and managing the world’s fresh water resources. 1．What is SnowEx trying to do? A．To learn about how fast snow melts on mountains. B．To figure out how much fresh water people need in a year. C．To explore more fresh water resources in the world. D．To find out the amount of fresh water in snowy mountains. 2．How do the sensors wor