21、Can Animals Be Nice?

Scientists recently discovered that animals who live in groups，such as elephants，foxes，and wolves，are especially likely to follow some rules．If they don't，the group might break apart．Group members would be forced to live alone．Then they'd have a harder time hunting and raising their young．

Sometimes，though，animals go out of their way to do what's right，even when there's nothing in it for them．Nobody knows why．Read the three surprising stories about nice behavior in the animal kingdom．

	An Unexpected Gift Teleki，a scientist，has been running after Sniff and the other wild chimpanzees（黑猩猩）through the forest，observing their behavior．Now，he decided to knock down some fruits to fill his own stomach．Grabbing a stick，Teleki hit the benches，but he couldn't do it．Watching him，Sniff imagined himself in Teleki's place．It picked an armload of fruits，swung down on a branch，and handed them to the astonished scientist．
	A Kind Heart Toby was one generous cat．For ten years，the kindly kitty shared his food with a dog named Katie．After supper，owner Gustafson always drops some food in Katie's bowl on the floor and some in Toby's dish on the kitchen counter．Gustafson kept the cat's dish up high to keep Katie from stealing Toby's treats．Katie didn't need to steal；she only had to beg．Every night she'd sit and stare at the cat．And Toby would flick some with his paw down to the waiting dog．
	A Friend in Need An African savanna elephant was grazing alone when a stranger，a forest elephant，arrived who had caught his trunk in a trap．While freeing himself，he'd hurt his mouth．He needed a help until his mouth got better．The forest elephant walked up and stuck his trunk into the healthy elephant's mouth．Elephants often aid members of their herd．But this healthy elephant didn't care that they weren't related．He reached down，uprooted a small tree，and stuffed it into his new friend's mouth．

1．According to passage，animals living in groups ________．

A．each do its own thing most of time               B．often kill those rule-breakers

C．have social ties similar to the humans'           D．feel good by helping humans

2．What does “an unexpected gift” refer to in the first story?

A．Sniff was absolutely different from other chimpanzees．

B．Chimpanzees are finally proved to be the cleverest animals．

C．The lucky scientist found a new species of chimpanzees．

D．Sniff seemed to understand the scientist and helped him．

3．Why did Gustafson give the food to her pets separately?

A．Because she was afraid Katie stole Toby's food．

B．Because she knew Toby appreciated sharing food．

C．Because Katie always needed more food than Toby．

D．Because she was doing a research on animals' behaviors．

4．The injured elephant asked for help by ________．

A．pretending to be a member of the herd

B．putting his trunk in the helper's mouth

C．getting closer to other elephants friendly

D．patting other elephant gently with his trunk

5．Which of the following questions isn't answered in the passage?

A．What did the chimpanzee do to the biologist?

B．How did the forest elephant get in a trouble?

C．Why did the animals help those of different kinds?

D．How did the Gustafson's pets share their food?