B.$7.39

　　C.$9.90

　　D.$13.0924.Which author’s book can best help teens make wise decisions on their future?A.Sean Covey

　　B.Markus Zusak

　　C.Siobhan Vivian

　　D.Wendelin Van Draanen

　　B

　　We see this scene all the time. A group of people stand on a street corner, waiting for the traffic light to change. Many look down at their smart phones instead of looking at the traffic light. One of them might step into traffic and could get hit by a car.

　　     Now Bodegraven-Reeuwijk, a Dutch town, plans to fix the problem. The plan is to add traffic lights on the ground. When walkers are looking down they might see them. Strips (条状) of lights were put into the ground. They use LED lights, in which electricity moves through a crystal (水晶). As the electricity moves, light is on. The “light lines” change the color at exactly the same time as the traffic lights above them.

　　     People look down when they look at their phones. They might notice the lights in the ground and then they will know the traffic light has changed color. Schools in Bodegraven-Reeuwijk near the light lines are excited because they are hoping the light lines will make students safer.

　　     In the U.S., “distracted walking” is a serious problem. According to the National Highway Traffic Safety Administration, 5376 people were killed by cars while walking in the U.S. in 2017. The year before, 4884 died this way.

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