华普教育·2020全国名校高考模拟信息卷 英语试题（四） 答案
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华普教育·2020全国名校高考模拟信息卷 英语试题（四） 答案 的资源验证如下：
With an improved economy, many travelers have been buying first or business class seats, leaving fewer for upgrades（升级）. Here are some strategies for getting free upgrade
1. Fly a lot.
This is the most common way to earn a free upgrade. Most airlines reserve some spaces for travelers who fly at least 5,000 miles per year. Five years ago, this meant half or more of domestic（国内的） first class travelers sat up front for free. But now, airlines are selling more high-price-seats, so on popular routes it is not unusual for more than 20 travelers to compete for one or two upgrades. But on routes with fewer business class travelers, free upgrades remain more plentiful.
2. Use miles.
If you're not a frequent traveler but still have some miles to fly, you may be able to use them for an upgrade. Be careful, though, as many airlines now ask not just for miles but also a cash copay. One example:on flights to Europe, American Airlines charges 5,000 miles, plus $110， for a one-way upgrade from discounted economy class to business class. For most domestic upgrade es, American Airlines wants15,000 miles plus$75.
3. Get luck.
Sometimes airlines overbook coach（ ） and a few travelers get no seats. Agents try to ensure the airline's' most loyal travelers get the nod（被选中）。 Agents usually have some flexibility to make sure the plane is full and takes off on time. So it's the easiest way for them to do it-they might upgrade someone else out of order.
4. Save a life.
Flight attendants don't usually upgrade passengers, even when empty seats remain. Doctors and nurses who answer an emergency call are sometimes an exception. If they comfort a passenger, flight attendants might allow them to sit in business or first class for the rest of the flight，
答案：
21.D细节理解题。根据第一、第二条免费升级座位的策略可知，飞行次数多的人和飞行距离长的人可以有机会免费升级座位。故选D
22.C细节理解题。根据第四条中的“Doctors and nurses who answer an emergency call are sometimes an exception. If they comfort passenger, flight attendants might allow them to sit in business or first class for the rest of the flight可知，在紧急情况下医生和护士被允许乘坐商务舱或头等舱。故选C
23.B推理判断题。文章介绍了旅客坐飞机时如何免费升级座位的策略，因此可能出现在旅行手册中。故选B
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