A. the album features mainly one singer

　　B. the players are from different countries

　　C. the album includes some literary elements

　　D. the album shows Ciaran Algar's harmony skills

　　B.

　　Controlling traffic is a complex and high-cost problem in many developed countries. It becomes more difficult and costly with the ever-increasing number of cars on the roads. But scientists and students at the Center for Advanced Transportation Technology, or CATT, at the University of Maryland are working to solve this problem. They are using simulation(模拟)technologies to help the government and private businesses control and react to changing trafficForbes.com says traffic congestion(阻塞）cost Americans $124 billion in 2017. It says that number could rise to $186 billion by 2030.But scientists at the CATT laboratory are trying to reduce those costs. They are developing a system that helps traffic managers, planners, emergency workers and businesses plan react better. Michael Pack is CATT director. He says, the system is important to help emergency workers, or first responders, reach an accident area faster.

　　"For every one minute that a lane on the freeway is blocked, the chance of another accident occurring goes up about 3%. So, if we can get a first responder out to the scene even a minute quicker and get him to clear the accident a minute quicker, that reduces overall delays and congestion significantly.

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