4. It can be inferred from the passage that
the shell should be ________.
A. funny-looking
B. waterproof
C. easily breakable
D. extremely strong
(B)
"Tipping" (给小费)is always a difficult business.
You do not want to give too much or too little, or tip the wrong person.
In Britain and America, people usually tip
waiters in restaurants, porters, taxi drivers and hairdressers. They do not tip
people in offices, cinemas, garages or airports.
Do you invite your friend to the
restaurant? Then you pay the bill. Does your friend invite you? Your friend
pays. If there are men and women in the party, the men usually pay.
These days, men and women are equal in many
ways. If you work in Britain or America, your boss could be a man or a woman.
There are increasing numbers of women in important positions in politics, law,
medicine and in the business world.
But it is still polite for men to open
doors for women and to ask them to go first.
And it is polite for men to stand up when
they are introduced to women.