Traveling by train is slower than plane, but it has its advantages(优点)．You can see the country you are traveling through．Modern trains have fortable seats and dinning-cars．They make even the longest journey enjoyable．The underlined word“They”in this passage means________．A.modern trains in the countryB.fortable seats and dining-carsC.the traveler on the modern trainsD.the slower ways of traveling
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B解析短文中讲到当今的火车有舒适的座位的餐车，这些设施使得即使长途旅途也变得成为是一种享受了．