满分5 > 高中英语试题 >

Plants can’t communicate by moving or ma...

Plants can’t communicate by moving or making sounds, as most animals do. Instead, plants Produce volatile compounds, chemicals that easily change from a liquid to a gas. A flower’s sweet smell, for example, comes from volatile compounds that the plant produces to attract insects such as Bugs and bees.

Plants can also detect volatile compounds produced by other plants. A tree under attack by Hungry insets, for instance, may give off volatile compounds that let other trees know about the Attack. In response, the other trees may send off chemicals to keep the bugs away ——or even  Chemicals that attract the bugs’ natural enemies.

Now scientists have created a quick way to understand what plants are saying: a chemical Sensor(传感器)called an electronic nose. The “e-nose” can tell compounds that crop plants make When they’re attacked Scientists say the e-nose could help quickly detect whether plants are being Eaten by insects. But today the only way to detect such insects is to visually inspect individual Plants. This is a challenging task for managers of greenhouses, enclosed gardens than can house Thousands of plants.

The research team worked with an e-nose than recognizes volatile compounds. Inside the device, 13 sensors chemically react with volatile compounds Based on these interactions, the e-nose gives off electronic signals that the scientists analyze using computer software.

To test the nose, the team presented it with healthy leaves from cucumber, pepper and tomato plants, all common greenhouse crops. Then scientists collected samples of air around damaged leaves from each type of crop, These plants had been damaged by insects, or by scientists who made holes in the leaves with a hole punch(打孔器). The e-nose, it turns out, could identify healthy cucumber, pepper and tomato plants based on The volatile compounds they produce, It could also identify tomato leaves that had been damaged. But even more impressive, the device could tell which type of damage ---- by insects or with a hole Punch ---- had been done to the tomato leaves.

With some fine-tuning, a device like the e-nose could one day be used in greenhouses to quickly spot harmful bugs, the researchers say. A device like this could also be used to identify fruits that are perfectly ripe and ready to pick and eat, says Natalia Dudareva, a biochemist at Purdue University in West Lafayette, Ind. who studies smells of flowers and plants. Hopefully, scientists believe, the device could bring large benefits to greenhouse managers in the near future.

1.We learn from the text that plants communicate with each other by____.

A. making some sounds        B. waving their leaves

C. producing some chemicals   D. sending out electronic signals

2.What did the scientists do to find out if the e-nose worked?

A. They presented it with all common crops.

B. They fixed 13 sensors inside the device.

C. They collected different damaged leaves.

D. They made tests on damaged and healthy leaves.

3.According to the writer, the most amazing thing about the e-nose is that it can___.

A. pick out ripe fruits

B. spot the insects quickly

C. distinguish different damages to the leaves

D. recognize unhealthy tomato leaves

4.We can infer from the last paragraph that the e-nose_____.

A. is unable to tell the smell of flowers

B. is not yet used in greenhouses

C. is designed by scientists at Purdue

D. is helpful in killing harmful insects

 

1.C 2.D 3.C 4.B 【解析】 1.推理判断题。从句中"Plants can't communicate by moving or making sounds, as most animals do. Instead, plants produce volatile compounds, chemicals that easily chasse from a liquid to a gas",可知选C。 2.细节理解题。从文章倒数第三段To test the nose, the team presented it with healthy leaves from-----可以找到答案D。 3.细节理解题。由倒数第二段"But even more impressive, the device could tell which type of damage - by insects or with a hole punch - had been done to the tomato leaves. "可知答案C。 4.推理判断题。由"With some fine tuning, a device like the e-nose could one day be used in greenhouses to quickly ….,one day是关键,可推断选B。
复制答案
考点分析:
相关试题推荐

Below are same classified ads from an English newspaper.

Classified ads

FOR DORECT CLASSIFIED SERVICE CALL 800-0557 10 A.M.-4P.M. MONDAY-FRIDAY

FOR SALE

———————————

COME to our moving sale-

Plants, pottery, books, clothes,

etc.Sat,Dec.14th ---9a.m.-5p.m.

1612 Femdale,Apt.1,800-4696

USED FUR COATS and

JACKETS ,Good condition

$30-$50.Call 800-0436 after

12 noon.

MOVING; Must sell.TV21”,

$50; AM/FM radio A/C or

battery, $15; cassette tape

recorder, $10.Call Jon or

Pat, 800-0739 after 5p.m. or

Weekends.

SHEEPSKIN COAT: man’s

size 42, 1year old. $85 after

6 p.m., 800-5224.

LOST AND FOUND

———————————

FOUND; Cat, 6 months old,

black and white markings.

Found near Linden and South

U. Steve.800-4661.

LOST; Gold wire rim glasses

In brown case. Campus area.

Reward. Call Gregg 800-9662,

FOUND: Nov.8th-----A black and

white puppy in Packard-Jewett

area 800-5770.

PERSONAL

————————————

OVERSEAS JOBS—Australia,

Europe, S. America, Africa.

Students  all professions and

occupation, $700 to $3000

monthly. Expenses paid,

overtime sightseeing. Free

information at STUDENTS’

UNION.

THE INTERNATIONAL

————————————

CENTER plans to publish a

booklet of student travel

adventures . If you’d like to

write about your foreign

experiences, unusual or just

plain interesting, call us

(800-9310) and ask for Mike

or Janet.

 

UNSURE WHAT TO DO?

Life-Planning Workshop. Dec.

13th-15th. Bob and Margaret

Atwood, 800-0046.

ROOMMATES

————————————

FEMALE ROOMMATE

WANTED: Own room near-

campus. Available December

1# . Rent $300 per month until

March 1#. $450 thereafter. Call

Jill for details, 800-7839.

NEED PERSON to assume

lease for own bedroom in apt.

near campus, $380/mo.starting

Jan. 1# Call 800-6157 after

5 p.m.

DOMESTIC SERVICE

————————————

EARLY HOUR WAKE-UP

SERVICE: For prompt,

courteous wake-up service,

call 800-0760.

HELP WANTED

————————————

BABYSITTER—MY HOME

If you are available a few

hours during the day, and some

evening to care for 2

school-age children, please

call Gayle Moore, days

800-1111, evening and

weekends 800-4964.

PERSONS WANTED for

Delivery work Own

Transportation Good pay

Apply 2311 E. Stadium. Office

101, after 9a.m.

TELEPHONE RECEPTION-

IST WANTED. NO experience

Necessary Good pay. Apply

2311 E. Stadium. office 101,

after 9a.m.

WAITRESS WANTED:

10a.m.-2p.m.or 10:30 a.m.-

5p.m. Apply inperson,2075

Main. Curtis Restaurant.

HELP WANTED for house

Cleaning 1/2 day on weekends

When—to be discussed for

mutual convenience. Good

wages. Sylvan Street. Call

800-2817.

 

1.Where will you post a notice if you need someone to look after your children?

A. PERSONAL.                      B. HELP WANTED.

C. DOMMESTIC SERVICE.            D. ROOMMATES.

2.A second-hand jacket will probably cost you________.

A. $60     B. $40      C. $20     D. $10

3.To have your travel notes published, you may contact_________.

A. Students’ Union                     B. Gayle Moore

C. The International Center              D. Life-Planning Workshop

4.If you want to have someone wake you up in the morning, you may call_________.

A. 800-5224                           B. 800-5770

C. 800-7839                           D. 800-0760

 

查看答案

I was in a rush as always, but this time it was for an important date I just couldn’t be late for! I found myself at a checkout counter behind an elderly woman seemingly in no hurry as she paid for her groceries. A PhD student with not a lot of money, I had hurried into the store to pick up some flowers. I was in a huge rush, thinking of my upcoming evening. I did not want to be late for this date.

We were in Boston, a place not always known for small conversation between strangers. The woman stopped unloading her basket and looked up at me. She smiled. It was a nice smile –warm and reassuring—and I returned her gift by smiling back.

“Must be a special lady, whoever it is that will be getting those beautiful flowers,” she said.

 “Yes, she’s special,” I said, and then to my embarrassment, the words kept coming out.

“It’s only our second date, but somehow I am just having the feeling she’s ‘the one’. Jokingly, I added, “The only problem is that I can’t figure out why she’d want to date a guy like me.”

“Well, I think she’s very lucky to have a boyfriend who brings her such lovely flowers and who is obviously in love with her,” the woman said.” “My husband used to bring me flowers every week –even when times were tough and we didn’t have much money. Those were incredible days; he was very romantic and – of course – I miss him since he’s passed away.”

I paid for my flowers as she was gathering up her groceries. There was no doubt in my mind as I walked up to her. I touched her on the shoulder and said, “You were right, you know. These flowers are indeed for a very special lady.” I handed her the flowers and thanked her for such a nice conversation.

It took her a moment to realize that I was giving her the flowers I had just purchased. “You have a wonderful evening,” I said. I left her with a big smile and my heart warmed as I saw her smelling the beautiful flowers.

I remember being slightly late for my date that night and telling my girlfriend the above story. A couple of years later, when I finally worked up the courage to ask her to marry me, she told me that this story had helped to seal it for her –that was the night that I won her heart.

1.Why was the writer in a hurry that day?

A.He was to meet his girlfriend.          B.He had to go back to school soon.

C.He was delayed by an elderly lady.      D.He had to pick up some groceries.

2.What does the underlined phrase “her gift”(Paragraph 2) refer to?

A.Her words.       B.Her smile.      C.Her flowers.      D.her politeness.

3.Why did the writer give his flowers to the elderly lady?

A.She told him a nice story.              B.She allowed him to pay first.

C.She gave him encouragement.           D.She liked flowers very much.

4.What is the message conveyed in the story?

A.Flowers are important for a date.        B.Small talk is helpful.

C.Love and kindness are rewarding.       D.Elderly people deserve respecting.

 

查看答案

The trip to that city was eye-opening for everyone, and near its end , all the young people in our group began to reflect on what it had meant. We __21__ the first night we had arrived. We had all gone into the markets of the city __22__ the young people could experience its energy. But what we actually saw simply   23  us all –the rundown houses, the children in rags, the people begging for money… Walking home,  24   under a low bridge, we came across  25   families of homeless people seeking a bit of dry ground to sleep on  26   he night. We had to step over bodies as we found our way through the darkness.

The poverty(贫困) was  27   than anything my young companions had ever imagined. Back in the hotel, an air of sadness settled over the group. Many  28   and cried. Spending time in this  29   moves a person to care about humanity.

That evening, our group spent hours talking about what we had  30  . Gently, I encouraged everyone to talk about the difficult  31   that day’s discoveries had inspired. Sitting together  32   a circle as everyone had a chance to speak, we all began to realize that  33   of us was alone in our struggle to cope with our reactions.

Based on my  34   in poverty-stricken areas, I suggested that  35   the emotions we had were painful, they could also be important in helping us to move forward. We all  36   that we had seen things that should never be allowed to happen.  37   , what could we do about it? Together, we began to brainstorm ways we could help to ease the  38   we had seen. As I encouraged group members to focus on  39   they could do, a sense of determination  40   the previous sadness. Instead of despair, these young people began to feel a call to action.

21.A.put up with       B.got back to      C.looked back on      D.made up for

22.A.now that         B.so that          C.as if              D.even if

23.A.puzzled          B.annoyed          C.embarrassed        D.shocked

24.A.marching         B.running          C.passing            D.moving

25.A.entire           B.normal           C.average            D.general

26.A.beyond           B.with             C.till                D.for

27.A.stronger         B.deeper           C.worse               D.less

28.A.gave up          B.broke down       C.set off             D.held on

29.A.environment       B.hotel             C.house               D.background

30.A.inspected         B.attempted        C.witnessed         D.challenged

31.A.feelings          B.decisions         C.thoughts           D.impressions

32.A.along            B.around           C.by                  D.in

33.A.neither           B.either            C.none             D.each

34.A.experiences       B.schedules         C.data              D.position

35.A.once             B.while            C.since              D.unless

36.A.supposed         B.advised           C.confirmed          D.agreed

37.A.Surely           B.Rather            C.Now                D.Indeed

38.A.burden           B.suffering          C.anxiety          D.difficulty

39.A.how             B.where            C.what                D.when

40.A.replaced          B.changed          C.covered          D.improved

 

查看答案

- What do you think of the movie?

- It’s fantastic. The only pity is that I __________ the beginning of it.

A.  Missed          B. had missed       C. miss             D. would miss

 

查看答案

In the good care of the nurses, the boy is ______ recovering from his heart operation.

A. quietly          B. actually         C. practically          D. gradually

 

查看答案
试题属性

Copyright @ 2008-2019 满分5 学习网 ManFen5.COM. All Rights Reserved.