B. Some reasons for the heavy backpack problem.

　　C. Some advantages of e-backpacks.

　　D. Some dangers of heavy backpacks.

　　B 难度：★★★

　　In order to avoid traffic jams, Gabriel, a librarian, has come up with a unique way of commuting （上下班往返）to work. He got the idea when he was stuck on his motorcycle in the heavy traffic fifteen years ago, and he turned his eyes to the Anacostia River. That?s when it hit him.

　　The river doesn’t exactly flow right outside his home, so he has to first take a 15-minute bike ride to reach his boat at the Bladensburg Waterfront Park. He then rows about five miles downriver. In the last part of the journey, he gets off the boat and onto another bike before arriving at the Library of Congress in Washington. The entire trip takes him 90 minutes. He takes the metro （地铁）back home from work, and the next day, the routine is contrary — he takes the metro to work and rows back home.

　　His unique commute has plenty of perks — fresh air, exercise, and most importantly, the absence of other commuters. Years of rowing has made Gabriel extremely fit for his age. He definitely appreciates the quiet and the water and the sounds of the oars in the water.

　　Of course, his commute over water hasn抰 been entirely incident-free. He抯 gotten completely wet in unexpected showers, midway through the journey. The wind has changed direction without notice. His boat has flipped overe （翻转） on three different occasions, and he once ran into a concrete barrier on the Benning Road Bridge. And pollution in the river has presented its own set of challenges. There were times when he would spot something unpleasant, like a dead dog or turtle, which would ruin his entire day. But Gabriel said that efforts to clean up the Anacostia have made things better lately.

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