A、A large sleeping accommodation. B、Two small sleepers. C、Riding in coach. D、One sleeper with a private bathroom. B文中提到，夫妇一起乘火车旅

With gas prices rising and airport security lines snaking longer than ever, why not book your nesl domestic vacation on a train? Compared to the alternatives, it’s comfortable, relaxing and civilized. Here are some tips about making your trip by rail as pleasant as possible. First, plan ahead. Most long-distance trains, especially the sleeping car accommodations, sell out very quickly. That’s particularly true during busy summer months. (30) But no matter when you travel,it’s a good idea to make your reservations at least 90 days in advance. You may want to consider turning your preliminary travel plan over to an experienced friend and letting him or her double-check all the details, make suggestions,and then handle the actual reservations. (31) If you want comfort and privacy on a long trip,a sleeper is a must,but they can be expensive,particularly during peak travel times. One way couples can save is,instead of reserving one large sleeper with a private bathroom, booking two sleepers, ideally ones directly across the aisle from each other. In giving up a private bathroom,you’ll have views from both sides of the train,and chances are the cost will be a lot less than the cost of one bedroom. For those who are riding in coach, here’s another tip: Bring a blanket, as you won’t get a complimentary blanket, even if your trip is an overnight one. (32) The temperature on rail cars is hard to regulate,and in the summer in particular,the air conditioning can make you quite chilly.
30. What should you better do when buying train tickets?
31. What’s best for a couple traveling long-distance on a tight budget?
32. If you bring nothing on a coach,what might happen?