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．

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?

19、Quit now? Are you kidding? Have you forgotten how your efforts are going and what you hope to ________?

A．undertake              B．conduct           C．perform               D．accomplish

18、Tuantuan and Yuanyuan express mainland people's hope for ________ reunion of all the Chinese people，which is considered to be ________ giant step forward．

A．a；a             B．不填；a           C．the；a                D．不填；the

17、It's already seven o'clock．Jack ________ be here at any moment．

A．should           B．need            C．must               D．can

16、With the growth of home-schooling，nobody knows exactly how many people ________ at home．

A．will teach              B．taught             C．are being taught           D．are teaching

15、Following the success of our discussion on Monday，we believe such meetings will become a ________ event．

A．normal            B．common             C．regular                      D．general

14、Some young people will be seeking work at 16，and others not ________ they complete further education．

A．after             B．while            C．as              D．until

13、If you want to book a round-trip ticket，you will need to pay only $10 ________．

A．yet          B．more            C．else             D．less