How do you greet your friends? People from different cultures may have different answers: shaking hands, nodding, kissing...But have you ever wondered how animals “say hello” to others?

We know how similar chimpanzees (黑猩猩) are to humans. It’s no surprise that their greetings are also close to ours. Chimpanzees usually greet each other with a hand touch, a hug or sometimes a kiss. Some of them can also communicate through simple sign language (手语).

Some animals seldom make loud sounds, for example, giraffes. Male giraffes often use their necks to greet each other. Their necks can reach up to two meters. When two giraffes meet, they may “shake” their necks and rub (摩擦) them against each other. This is to feel how strong and tall the other is.

Dolphins greet one another with whistles (哨叫声). They can hear other dolphins from many kilometers away. Every dolphin has a different whistle. It tells information about the dolphin, such as its age and health. When two groups of dolphins meet, they each choose a member of the other group to “talk” to. The two groups can then join up and travel together.

【小题1】According to the text, chimpanzees may greet each other ________.

A．by saying “hello”	B．by touching hands
C．through a real language	D．through a simple sound

【小题2】What can we know about giraffes?

A．Giraffes often communicate mainly through loud sounds.

B．Giraffes greet each other by rubbing their noses together.

C．When a male giraffe runs into another one, they use necks to hit each other.

D．Giraffes learn about the strength and height of each other through greeting.

【小题3】When two groups of dolphins meet, they ________.

A．use their tails to greet each other	B．compete to decide the new leader
C．each select a member of the other group to “talk” to	D．avoid talking to any members of the other group

【小题4】How is the text organized?
(① = Paragraph 1, ② = Paragraph 2, ...)

A．

B．

C．

D．