二、听力填空
Directions: In this section, you will hear a passage three times. When the passage is read for the first time, you should listen carefully for its general idea. When the passage is read for the second time, you are required to fill in the blanks with the exact words you have just heard. Finally, when the passage is read for the third time, you should check what you have written.37、 Even to those who study mining disasters, last week's explosion in Soma, Turkey, was shocking.The (26)_________ cause of the explosion is unknown, but it is thought to have started with a spark from electrical equipment that ignited coal dust or methane. The (27)_________ is nearly 300, and dozens of people are still missing. While citizens in Turkey respond with angry protests, engineers around the world are working to prepare fleets of robots to help with the next disaster.
Mine explosions like the one in Turkey are (28)_________ caused when methane gas builds up and (29)_________ , and the flames are carried quickly by flammable coal dust hanging in the air. Other countries like the US and the UK have adopted relatively low-tech (30)_________ prevent explosions and keep them from spreading, such as putting steel boxes around (31) to contain sparks, or spreading stone dust throughout the mine to dilute the coal dust and (32)_________ the flames.
But when things go wrong, a burned-out mine can be a dangerous place for rescue workers. So mine safety engineers want to send robots to scout ahead of humans to test the air quality and find safe(33)_________ to trapped survivors, and perhaps even carry them out. Such efforts have been (34)_________ challenges. After the Crandall Canyon mine in Utah collapsed in 2007, killing six miners, a camera scout robot got stuck in a borehole.
There are signs that the technology is (35) _________. This week, the US Office of Mine Safety and Health Research called for proposals for robots that can be lowered into boreholes, explore up to about 1,000 meters ahead of rescue teams, and act as pack mules.
请回答第26题_________
38、 请回答第27题_________
39、 请回答第28题_________
40、 请回答第29题_________
41、 请回答第30题_________
42、
请回答第31题_________
43、 请回答第32题_________
44、 请回答第33题_________
45、 请回答第34题_________
46、 请回答第35题_________