太原师院附中高三九月月考.docx

太原师院附中2016-2017学年第一学期高三年级第一次月考英语师院（9月）第一部分阅读理解（共两节，20小题，每小题3分，共60分）第一节：阅读理解（共15小题；每小题3分，满分45分）阅读下列短文，从每题所给的四个选项中（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。AWhen you think of Saturn, you probably picture a planet surrounded by colorful rings. For years, Saturn was known to have seven main rings. But recently, NASA scientists announced that they had spotted an eighth.???? This never-before-seen ring is not only Saturn’s biggest, but also the largest in the solar system. According to its discoverers, the ring is so huge that it would take one billion Earths to fill it.???? Four hundred years ago, Galileo first glimpsed Saturn’s rings using his telescope. NASA scientists also used a telescope to spot the new ring. The Spitzer telescope, launched in 2003, orbits the sun while taking pictures of faraway objects in space.???? The new ring is almost invisible to the human eye. But the Spitzer telescope can detect the glow of extremely cold objects, such as that of this giant ring, which is minus 316 degrees Fahrenheit（华氏摄氏度的）. By focusing on the glow of the ring’s cool dust, the Spitzer made it easy to find, says one of the scientists.???? The ring circles Saturn at a distance of eight million miles, about 50 times farther away from the planet than its other rings. It also has a completely different tilt(倾斜).???? The giant ring is made up of a thin layer of dust that scientists think comes from Saturn’s moon Phoebe. Why? Phoebe orbits within the ring, and markings on it show that it has been hit many times by space rocks and clumps of ice. Each time Phoebe is hit, dust flies into space and goes into orbit, adding particles (颗粒)to the giant ring.???? The discovery of the new ring also provides scientists with an answer to a mystery. Another Saturn’s moon, Lapetus, has a bright side and a dark one. Scientists have long wondered why, and the discovery of the new ring suggests that dust from it is constantly moving toward Saturn and slamming into Lapetus.1. According to the text, the eighth