12．With fuel costs rising and airlines finding more fees to impose （强加，征税）on travelers every day，airfare isn't getting any cheaper．Since you can't drive to all your dream destinations，flying is the only way to go sometimes and，undeniably，the fastest．Luckily，there are plenty of ways to find the most affordable fares and also avoid paying as many extra charges as possible when you plan ahead．
Get the best fare．Airlines put out their fare sales on Tuesday morning，making this day the best day to book a flight for less．
Fly during the least popular times．Tuesday，Wednesday and Saturday are the slowest days to fly，which means cheaper deals than the rest of the week．You can also find reduced rates on early morning flights，since many people don't like to get up before the sun to get to the airport．Earlier boarding times can also considerably cut down your chances of getting bumped on an overbooked flight or delayed because of other delayed flights or mechanical issues．
Choose your seat later．Some airlines charge you to pick your seat when you book online，adding even more to the bottom line of your ticket cost．If you show up early on your travel day，you can still get suitable seats．Some of the best seats get held back until flight day，unless others are willing to pay extra for them ahead of time，so you still have the chance at one of those．
Fly on holidays．You already know that summer is the most expensive time to fly，and even though most other times are more affordable，the days surrounding holidays can be crazy．Save big if you're willing to travel on major holidays，such as Thanksgiving and Christmas．
Don't wait until the last-minute to book．Many travelers don't know that there's a sweet spot for booking and getting the best price on your tickets．Book too early or too late and you could end up paying more than you need to．The best time to book is between three months and six weeks from when you want to travel．
21．The passage is intended toD．
A．inform us how to book a cheaper ticket
B．tell us how to choose the seat and time for a flight
C．persuade us into travelling by air
D．inform us of some best ways to save money on a flight
22．Which of the following statements is not true？C
A．Airline travelers are supposed to pay more for the rising fuel costs
B．Early morning flight will help avoid some bumps and delays．
C．You can only book your seat online before or on your flight day．
D．Booking too early may cost you more money on your tickets．
23．Which is the best time to book the flight for October 2nd？B
A．May 15th B．August 15th
C．June 15th D．September 15th．
分析 本文主要讲述了在燃油费和机场建设费日益增长的今天，乘坐飞机会是非常昂贵的．本文告诉了读者几点减少费用，利用飞机便宜出行的建议．
解答 21．D 推理题．根据文章内容，主要讲述了在燃油费和机场建设费日益增长的今天，乘坐飞机会是非常昂贵的．本文告诉了读者几点减少费用，利用飞机便宜出行的建议．结合Luckily，there are plenty of ways to find the most affordable fares and also avoid paying as many extra charges as possible when you plan ahead．目的在于给读者相关的建议，故选D
22．C 细节题．根据文章内容If you show up early on your travel day，you can still get suitable seats．Some of the best seats get held back until flight day，unless others are willing to pay extra for them ahead of time，so you still have the chance at one of those．由此可知，并不是在你乘坐飞机的前一天或者当天才能在网上预订座位，故选C
23．B 推理题．根据文章内容The best time to book is between three months and six weeks from when you want to travel．预订机票的最后时机是你想要乘机的前3个月至6个星期前．如果想要10月2号出行，结合4个选项，则最佳的订票时间应为8月15号．故选B，其它时间要么过早要么过迟．
点评 本文是一个科教类阅读理解，题目涉及多道细节理解题，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据．
