people are presented with three tip choices - 20%, 25% or 30% - they're more likely to choose the middle option even if it's more than the traditional 20%, according to a separate 2014 analysis of 13 million New York City taxi rides.

　　If the service is twice as expensive during a rain storm or public transport delay, the customer has the right not to tip. However, if the driver is extra helpful or avoids a traffic jam to reach your destination in a more timely manner, you could give an extra tip, says Uber, who will leave tipping options in the hands of the consumer rather than the app.

　　语篇解读：随着网络的广泛应用，优步等打车软件已经越来越普及，乘客在享受这些打车软件带来的便利的同时，也体会到了一些随之而来的不便，比如文章所谈论的在乘坐优步汽车时，需不需要给小费的问题。

　　1．Compared with taxi drivers, Uber drivers ________.

　　A．enjoy more freedom and choices

　　B．support the company's practice

　　C．clock up the miles while driving

　　D．receive customers reviews directly

　　解析：选A　细节理解题。根据第三段中的"They use their own vehicles, receive customer reviews via the app's five­star rating system and make their own hours"可知，和普通的出租车司机相比，优步的司机有更多的自由和选择。故选A项。

　　2．The underlined word "deactivated" in Paragraph 3 probably means "________"．

　　A．removed　　　　　　 B．degraded

　　C．tracked D．charged

　　解析：选A　词义猜测题。根据第三段中的"If they ask a customer for a tip or put up a sign, that customer could give the driver a low star­rating"可知，如果他们让顾客付小费或张贴一个标志，这个顾客可能会给司机低星级的评价，这个司机最终会被从app上撤下。由此可猜测，deactivated意为"除掉"。故选A项。

　　3．From the survey we can conclude most customers ________.

　　A．would probably tip if there is an option

　　B．usually do as the "no tip" sign suggests

　　C．tip because of Uber drivers' good service

　　D．are disappointed to reach into their pockets

解析：选B　推理判断题。根据第五段中的"Nearly 30% people would be more likely to