酒后驾车将受到法律追究。交警常用一种“酒精检测仪”检查司机是否酒后驾车。其反应原理为C₂H₅OH + 4CrO₃ + 6H₂SO₄ =2X + 2CO₂↑+9H₂O，反应中红色的转化为绿色的化合物X，则X的化学式为(   )

    The Bamboo Train, or “Norry” in the local language, is quite famous in Cambodia. The train is in fact a big bamboo bed with four wheels and a small engine. It can run at the s____ of up to 50 km/h on the tracks. Lots of v____go to Cambodia to enjoy the Bamboo Train ride. They have to pay 5 dollars per person to g____on the train. The best time to take the train is from 4 to 6 o'clock in the afternoon, b____it is cool when people enjoy the countryside view. “It feels more like a roller coaster, but it's really nice,” a Germany tourist Theresa Kessemeier said after she c____a ride. The Bamboo Train has become a popular tourist at action.