根据以下材料，回答
Gestures aren′ t the only area in whichthe unwary traveler can get tripped up. Foreign cultures adhere to differentbusiness customs and behavior. For example: Caffeine junkies should re strain themselvesin the Middle East. "Three cups of tea or coffee is usually the politelimit in offices and during social calls," counsels "TravelPak", a free publication of Alia, the Royal Jordanian Airline. "Butif your host keeps going, you also may continue sipping. If you′ve had yourfill, give your empty cup a quick twist a sort of wiggle--as you hand it back.That means "No more, thank you."
Middle East visitors also should not besurprised "if others barge right into the office in the middle of yourconversation with the person you are seeing," notes "TravelPak". An old Arab custom calls for keeping an "open office." TheBritish, however, consider it impolite to interrupt a visitor, even after allbusiness has been transacted. The commercial caller is expected to be sensitiveto this point, know when to stop, and initiate his or her own departure. InJapan certain guests at evening business gatherings will leave early. Theyshould be allowed to leave without effusive good-byes. The Japanese considerformal departures to be disruptive in such cases and disturbing to remainingguests. In Scandinavia and Finland business guests may be asked to shed theirclothes and join their hosts in a sauna (桑拿).
The invitation is a sign that a goodworking relationship has been established. In the Arab world, the word"no" must be mentioned three times before it is accepted. Incontrast, it is considered good business manners to make many and long effortsto pick up the check. In the People′ s Republic of China, gift giving isconsidered an insult, says Patrick J. Lewis, President of Club Universe, a LosAngeles tour operator. "If youwant to give someone a gift, make sure it′s modest in value. This will not beconsidered offensive, but it may be declined," The Chinese manner ofex
A.impolite to drink at least 3 cups ofcoffee
B.impolite to drink more than 3 cups ofcoffee unless your host drinks more
C.polite to ask the host to give you asmore as he can
D.polite to leave a party as early as youwant