Many people like to travel. The problem is getting your pet to the【C1】______. In recent years, transporting pets on flights has grown more【C2】______—and more expensive. All major carriers have【C3】______raised the fees that they【C4】______for bringing pets onboard, matching, or in some cases, 【C5】______, the fee for children flying alone. Fees【C6】______depending on whether the pet flies under your seat, or as checked baggage, which【C7】______extra handling. Pet safety has also become a more【C8】______issue. Incidents of animals being lost, injured or dying have recently【C9】______. Thirty-nine animals died while flying aboard【C10】______jets last year, compared with 22 two years ago. 【C11】______those numbers are a small percentage of the hundreds of thousands of animals flown by the airlines each year, they expose the dangers that pets may face while traveling. Not that airlines don"t 【C12】______ risks, but that some pets are liable to breathing problems or【C13】______ illness. Delta, which reported several dog【C14】______last year, has changed its policy and now【C15】______some breeds from its planes.Despite the inconveniences, airlines say they are going out of their way to be pet【C16】______. Last year Frontier Airlines, in【C17】______to demand, began accepting pets in the passenger cabin for the first time. 【C18】______it had transported pets only as baggage. If you are considering putting your pet on a plane, here are a few tips to【C19】______the process. Don"t wait until the last minute to book, for airlines limit the number of pets in the cabin. Placing your pet on the floor of the car beforehand so it can feel the【C20】______as it will on a plane.
【答案解析】解析：本句的主语transporting pets on fights(携带宠物坐飞机旅行)是一种做法，由下文的and more expebsive(更加昂贵)可知，该做法越来越困难，C项complicated“复杂的”一般指的是事情复杂得难以解释或解决，最为合适。
单选题
【C3】
【正确答案】
B
【答案解析】解析：空格处所在的副词修饰raised the fees(提高费用)，表示“费用提高的幅度”，由下文的in some case…the fee for children flying alone(有时甚至……儿童单独乘机的费用)可知，费用提高的幅度很大，B项significantly“显著地，大大地”，符合语境。