If you were to walk up to Arthur Bonner and say,“Hey,Butterfly Man,”his face would break into a smile.The title suits him.And he loves it.

Arthur Bonner works with the Palos Verdes blue butterfly(蝴蝶),once thought to have died out.Today the butterfly is coming back—thanks to him.But years ago if you’d told him this was what he’d be doing someday,he would have laughed,“You’re crazy.”As a boy,he used to be “a little tough guy on the streets”.At age thirteen,he was caught by police for stealing.At eighteen,he landed in prison for shooting a man.

“I knew it had hurt my mom,”Bonner said after he got out of prison.“So I told myself I would not put my mom through that pain again.”

One day he met Professor Mattoni,who was working to rebuild the habitat(栖息地) for an endangered butterfly called EI Segundo blue.

“I saw the sign‘Butterfly Habitat’and asked,‘How can you have a habitat when the butterflies can just fly away?’”Bonner recalls,“Dr.Mattoni laughed and handed me a magnifying glass(放大镜),‘Look at the leaves.’I could see all these caterpillars(蝴蝶的幼虫) on the plant.Dr.Mattoni explained,‘Without the plant,there are no butterflies.’”

Weeks later,Bonner received a call from Dr.Mattoni,who told him there was a butterfly that needed help.That was how he met the Palos Verdes blue.Since then he’s been working for four years to help bring the butterfly back.He grows astragalus,the only plant the butterfly eats.He collects butterflies and brings them into a lab to lay eggs.Then he puts new butterflies into the habitat.

The butterfly’s population,once almost zero,is now up to 900.For their work,Bonner and Dr.Mattoni received lots of awards.But for Bonner,he earned something more:he turned his life around.

For six years now Bonner has kept his promise to stay out of prison.While he’s bringing back the Palos Verdes blue,the butterfly has helped bring him back,too.

When he was young,Arthur Bonner _______.

A.broke the law and ended up in prison

B.was fond of shooting and hurt his mom

C.often laughed at people on the streets

D.often caught butterflies and took them home

Bonner came to know the Palos Verdes blue after he _______.

A.found the butterfly had died out

B.won many prizes from his professor

C.met Dr.Mattoni,a professor of biology

D.collected butterflies and put them into a lab

From the last sentence of the text,we learn that raising butterflies has _______.

A.made Bonner famous

B.changed Bonner’s life

C.brought Bonner wealth

D.enriched Bonner’s knowledge

Which of the following would be the best title for the text?

A.A Promise to Mom

B.A Man Saved by Butterflies

C.A Story of Butterflies

D.A Job Offered by Dr.Mattoni

Scientist Florence Wambugu works with farmers in Kenya, a country in East Africa. She helps them grow bigger and better crops. Wambugu is especially interested in finding simple ways to produce more food.

In the past ten years, Wambugu has spent much of her time studying sweet potatoes, which are an important food in her part of Kenya. A virus (病毒) kept attacking the plants. It stopped the sweet potatoes from growing well. Because of the virus, some farmers lost three quarters of their crops.

Wambugu went to war against the virus. Her research for a way to save the sweet potatoes led to a lab in St. Louis, Missouri.

The lab mainly works on genes (基因), the chemical “computer programs” found in the cells of living things. Genes tell a plant to produce pink flowers or an animal to grow black hair. Now scientists have found ways to move genes from one living thing to another. That process is called genetic engineering.

Wambugu spent three years in the lab. As a result, she created a sweet potato plant that could fight off the virus. Wambugu tested her research in Kenya, and her plants produced wonderful sweet potatoes.

That’s just the beginning, Wambugu believes. Genetically modified (转基因的) foods, she thinks, could help farmers in poor countries grow badly needed crops, thus, fewer people will go hungry.

1.The text is written mainly to _______.

2.What caused Wambugu to set up a lab in St. Louis, Missouri?

3.The fourth paragraph mainly explains what ________ is.

4. What is Wambugu’s attitude toward “genetic engineering”?

— It’s the office! So you        know eating is not allowed here.

— Oh, sorry.

A. must                          B. will                          C. may                        D. need

答案A

Ero Carrera is watching the computer screen in a lab in California as he tracks a new computer virus slowly circling the globe, targeting cell phones. Working from the US office of the Finnish computer   21   firm, Carrera knows this virus could be the start of something big and   22  . He’s one of a couple of hundred “virus hunters” worldwide who guard computers and cell phones from   23  . That’s the job for these unlikely action heroes of the Internet age, where quick and curious minds are more important than strong   24  .

    Carrera works with Tzvetan Chaliavski to form the two-man team in California. Like that of other employees in the anti-virus companies in the world, their work is at the battle front of providing   25   from the damaging of computer virus, worms and Trojans. They break down software to discover a new virus and crack its code. Then they   26   and ship out a software update to customers. Roughly 300 new samples of viruses await the pair on a(n)  27   day.

    Carrera has created a mathematical formula(公式), to   28   easily the software structure of viruses. With it, he is better able to compare the many variants(变种) and families of malware(恶意软件). To his   29  , Chaliavski, it doesn’t even matter why someone would create a virus. All that   30   is the hunt.

21. A. advertising          B. commercial                     C. printing                    D. security

22. A. admiring             B. exciting                    C. inviting                    D. threatening

23. A. attack                 B. bombing                  C. competition                     D. struggle

24. A. heads                  B. feelings                    C. muscles                    D. spirits

25. A. access                 B. contact                     C. measures                  D. protection

26. A. copy                   B. create                    C. delete                    D. download

27. A. average               B. original                    C. previous                   D. special

28. A. get off                B. make out                  C. pick up                    D. take in

29. A. assistant                  B. manager                   C. partner                            D. secretary

30. A. ignores               B. matters                     C. overlooks                 D. rejects