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Unit 4 Earthquakes (60分钟79分) Part A 一、阅读理解(共7小题;每小题2分,满分14分) A Scientists at UC Berkeley released a video showing an earthquake early-warning system that sent an alert before the magnitude-6.0 Napa earthquake on Sunday morning. Officials said the system provided an alert 10 seconds before the quake was felt. California is working to complete a statewide system,which could be completed in the next few years. Once fully developed,the system could give downtown Los Angeles 40 to 50 seconds of warning that the “Big One” was headed from the San Andreas fault,giving time for elevators to stop at the next floor and open up,firefighters to open up garage doors,high-speed trains to slow down to avoid derailment and surgeons to take the scalpel(手术刀) out of a patient. A lack of funds,however,has slowed the system’s progress. The system works because while earthquakes travel at the speed of sound,sensors that initially detect the shaking near the epicenter of a quake can send a message faster—at the speed of light—to warn residents farther away that the quake is coming. Rep.Adam Schiff (D-Burbank) said the successful test showed the need for the system. “While this was not the ‘big one’,we need to be prepared to save lives and protect vital infrastructure(基础设施)—even a few seconds of warning will allow people to seek cover,automatically slow or stop trains,pause surgeries and more,” he said in a statement. | 
