阅读理解。

     Canadians and Americans usually tip in places like restaurants, airports, hotels and hair salons because

many people who work in these places get low salaries. A tip shows that the customer is pleased with the

service.

     At airports, porters usually get a dollar tip for each bag. Hotel bellhops (男侍) usually get a dollar for

carrying one or two suitcases. A hotel door attendant (服务生) gets about a dollar for getting a taxi for

people. Many people also tip hotel room attendants, especially when they stay in a hotel for several days.

They usually leave a dollar for each day.

     The usual tip for other kinds of services--for example, for taxi drivers, barbers, hairdressers, waiters

and waitresses-is between 10 and 20 percent of the bill. The size of the tip depends on how pleased the

customer is. In most restaurants, the check does not include a service charge. If the group is large,

however, there may be an added service charge. There is no tipping in cafeterias (自助食堂) or fast-food

restaurants.

1. In the countries mentioned people tip usually to _____. [ ]

A. express their satisfaction

B. show their support

C. encourage better service

D. show off

2. What tip should you at least leave for a $50 restaurant check? [ ]

A. $25

B. $5

C. $10

D. $15

3. In _____ you don't have to tip. [ ]

A. a hotel

B. a barber shop

C. a McDonald's restaurant

D. a restaurant