閱讀下面材料,在空白處填入適當?shù)膬热荩?個單詞)或括號內單詞的正確形式。

It is not a secret 1. trees are vital to our life. They provide us with food, wood and most 2. (important), oxygen. Now there is one more thing we can add to this list—blocking out harmful bacteria from water.

The discovery 3. (make) by a team 4. (consist) of scientists from the Massachusetts Institute of Technology (MIT) and high school students 5. were seeking a natural water filter(過濾)—one that would help communities in developing countries that do not have 6. (accessible) to modern water filter systems.

The 7. (research), led by Professor Rohit Karnik, decided to turn8.______ trees for help, because they could allow liquid to flow through, while blocking out air bubbles.

They began by cutting 1.5-inch-wide sections of tree bark from the branches of a white pine tree. The people related then tested the wood’s filtering ability by pouring water containing red dye particles of different sizes through. To their 9. (amaze), they found that it was effective in trapping all the particles. Greatly 10. (encourage), the team conducted another experiment, this time with water that contained bacteria. Sure enough, the sapwood held back 99% of the bacteria, allowing only 1% to flow through.

練習冊系列答案
相關習題

科目:高中英語 來源:2016-2017學年廣西桂林市高二上期段考英語卷(解析版) 題型:閱讀理解

I was waiting for a phone call from my agent. He had left a message the night before, telling me that my show was to be cancelled. I called him several times, but each time his secretary told me that he was in a meeting and that he would call me later. So I waited and waited, but there was still no call. Three hours passing by, I became more and more impatient. I was certain that my agent didn’t care about my work, and he didn’t care about me. I was overcome with that thought. I started to shout at the phone, “Let me wait, will you? Who do you think you are?”

At that time I didn’t realize my wife was looking on. Without showing her surprise, she rushed in, seized the phone, tore off the wires, and shouted at the phone, “Yeah! Who do you think you are? Bad telephone! Bad telephone!” And she swept it into the wastebasket.

I stood watching her, speechless. What on earth...?

She stepped to the doorway and shouted at the rest of the house, “Now hear this! All objects in this room---if you do anything to upset my husband, out you go!”

Then she turned to me, kissed me and said calmly, “Honey, you just have to learn how to take control.” With that, she left the room.

After watching a crazy woman rushing in and out, shouting at everything in sight , I noticed that something in my mood (情緒) had changed. I was laughing. How could I have trouble with that phone? Her anties helped me realize I had been driven crazy by small things. Twenty minutes later my agent did call. I was able to listen to him and talk to him calmly.

1.Why did the author shout at the telephone?

A. He was mad at the telephone.

B. He was angry with his agent.

C. He was anxious about his wife.

D. He was impatient with the secretary.

2.What made the author laugh?

A. His own behavior.

B. His wife’s suggestion.

C. His changeable feelings.

D. His wife’s sweet kiss.

3.What does the underlined word “anties” in the last paragraph refer to?

A. Angry words B. Unusual actions

C. Surprising looks D. Anxious feelings

查看答案和解析>>

科目:高中英語 來源:2016-2017學年內蒙古高二上期第二次月考英語卷(解析版) 題型:單項填空

Little Tom cured himself ______ the habit of lying.

A. to B. from C. for D. of

查看答案和解析>>

科目:高中英語 來源:2016-2017學年內蒙古高二上期第二次月考英語卷(解析版) 題型:單項填空

When Tom got home he saw a message on the table, _______ he would be back soon.

A. read B. reads C. to read D. reading

查看答案和解析>>

科目:高中英語 來源:2016-2017學年山西省高二上期中考英語卷(解析版) 題型:閱讀理解

If you have a chance to go to Finland, you will probably be surprised to find how “foolish” the Finnish people are.

Take the taxi drivers for example. Taxis in Finland are mostly high-class Benz(奔馳)with a fare of two US dollars a kilometer. You can go anywhere in one, tell the driver to drop you at any place, say that you have some business to attend to, and then walk off without paying your fare. The driver would not show the least sign of anxiety.

The dining rooms in all big hotels not only serve their guests, but also serve outside diners. Hotel guests have their meals free, so they naturally go to the free dining rooms to have their meals. The most they would do to show their good faith is to wave their registration card to the waiter. With such a loose check, you can easily use any old registration card to take a couple of friends to dine free of charge.

The Finnish workers are paid by the hour. They are very much on their own as soon as they have agreed with the boss on the rate(價錢). From then on they just say how many hours they have worked and they will be paid accordingly(相應地).

With so many loopholes(漏洞)in everyday life, surely Finland must be a heaven to those who love to take “petty advantages”. But the strange thing is, all the taxi passengers would always come back to pay their fare after they have attended to their business; not a single outsider has ever been found in the free hotel dining rooms. And workers always give an honest account of the exact hours they put in. As the Finns always act on good faith in everything they do, living in such a society has turned everyone into a real “gentleman”.

In a society of such high moral practice, what need is there for people to be on guard against others?

1. While taking a taxi in Finland, _________.

A. a passenger can never be turned down by the taxi driver wherever he wants to go

B. a passenger pays two US dollars for a taxi ride

C. a passenger can go anywhere without having to pay the driver

D. a passenger needs to provide good faith demonstration before they leave without paying

2.We know from the passage that big hotels in Finland _________.

A. provide meals for only those who live in the hotels

B. provide meals for any diners

C. provide free wine and charge for food

D. are mostly poorly managed

3.Which of the following is NOT true according to the passage?

A. The workers in Finland are paid by the hour.

B. The bosses in Finland are too busy to check the working hours of their employees.

C. The workers are always honest with their working hours.

D. The workers and their bosses will make an agreement in advance about the pay.

4.It can be concluded that ___________.

A. Finnish people are not smart enough in daily life

B. Finland has been a good place for cheats

C. the Finnish society is of very high moral level

D. all the Finns are rich

查看答案和解析>>

科目:高中英語 來源:2017屆安徽蚌埠二中高三上期中考試英語試卷(解析版) 題型:閱讀理解

My 16-year-old son, Anton, had gone to the local swimming hole. Most of the kids swim there, and there are plenty of rocks for them to use as safe harbors, so I had no fears for his safety.

Still, the firefighter's first words "You need to come up here to the Stillwater River" made me catch my breath, and his follow-up words gave me relief: “Your son is OK.”

When I got to the river, I immediately saw the firetruck, ambulance and Anton, wrapped with a towel about his shoulders, sitting quietly on a low platform of the fire engine.

I hurried over to him. "You OK?"I asked.

“Yeah,” was all he said. But my eyes begged for an explanation, I didn't get it from my son, however, who tends to play his cards close to his vest

The story was this: A woman was being swept under water. Hearing the cries, Anton and his friend Tyler, without hesitation, swam out to her, and brought her safely to shore.

In an age in which the word "hero" is broadcast with abandon and seemingly applied to anyone who makes it through the day, I realized the real thing in my son. The teens are stubborn and self-centered, but that didn't mean they have no desire to do good.

Still shocked by my son's daring, I drove him home. Along the way, I tried to dig out some more information from him but he had precious little to say. The only words he said were, “What's for supper?”

I spent some time alone that evening, thinking about the tragedy that might have been. The next morning, when Anton got up, I half expected him to tell me the story. But all he did was toast some bread, pull himself together, and head for the door to start a new day. Watching from the window, I was reminded that still water often runs deep.

1.Why did the mother allow her son to swim there?

A.He was an excellent swimmer.

B.The water of the river is shallow.

C.The rocks can be of help if there's danger.

D.He was old enough to swim.

2.The underlined part "who tends to play his cards close to his vest" probably means ________.

A.Anton is unwilling to tell others what he thinks

B.Anton is a boy fond of swimming with other kids

C.Anton always has a desire to help others

D.Anton seldom changes his mind

3.In the mother's eyes, what her son did was ________.

A.dangerous but interesting

B.unexpected and courageous

C.meaningful but difficult

D.a(chǎn)wful and absurd

4.What might be the best title for the passage?

A.A Proud MotherB.Anton, A Silent Boy

C.A Good DeedD.My Son, My Hero

查看答案和解析>>

科目:高中英語 來源:2017屆甘肅省高三上第三次月考試英語卷(解析版) 題型:閱讀理解

The President Goes to School

Last week,President Barack Obama gave a back-to-school speech to students at the Julia R.Masterman Laboratory and Demonstration School in Philadelphia,Pennsylvania. Students in schools across the country also tuned in to watch the President's speech on TV. He stressed the importance of trying new things,working hard and believing in yourself.

We Need to Work Hard

While acknowledging that times are difficult for families across the country,Obama reminded students that hard work now can mean big success later.“Nobody gets to write your destiny(命運) but you,”he said.“Your future is in your hands. Your life is what you make of it. And nothing,absolutely nothing,is beyond your reach.”

Obama spoke about his own life,and lessons he learned from his mother,who had to remind him to stay focused on his studies. He told students the secret of success:Showing up to school on time. Paying attention in class. Doing your homework. Studying for exams. Staying out of trouble.

Expand Your Mind

Obama encouraged students to hug what makes them different.“We shouldn't be embarrassed by the things that make us different,”he said.“We should be proud of them.”

He also suggested taking advantage of all of the chances at school,and always being open to trying new things.“That you're not the best at something today doesn't mean you can't be tomorrow,”he said.“Even if you don't think of yourself as a math person or as a science person—you can still excel in these subjects if you're willing to make the effort. And you may find out you have talents you'd never dreamed of.”

1.Who plays the most important role in writing your life according to Obama?

A.Yourself.B.Your parents.C.Nobody.D.Your teachers.

2.What didn't Obama talk about when he gave speech to students?

A.His own life.

B.Lessons he learned from his mother.

C.The secret of success.

D.Why he gave this speech.

3.Which of the following isn't Obama's opinion?

A.Students should pay attention in class.

B.Students should study hard for exams.

C.Students should go to school on time.

D.Get into trouble and solve it by yourself.

4.What's the right attitude when facing things that make people different according to Obama?

A.Happy.B.Embarrassed.C.Proud.D.Sad.

查看答案和解析>>

科目:高中英語 來源:2017屆貴州銅仁市高三上期第三次月英語試卷(解析版) 題型:語法填空

Most students do an IQ test early in their school career. Even if they never see their results, they feel that their IQ is 1.______ determines how well they are going to do in life. When they see other 2._______(student) doing better than them, they usually believe that those students have a 3._____ (high) IQ and that there is nothing they can do 4.____ (change) facts. However, new research into EQ suggests that success is not 5.____ (simple) the result of a high IQ.

While your IQ tells you how 6._______ (intelligence) you are, your EQ tells you how well you use your intelligence. Professor Salovery, who 7._______ (invent) the term EQ, gives the following description: At work, it is IQ 8._____ gets you promoted. Supported9._______ his academic research, Professor Salovery suggests that when predicting someone's future success, their character, 10._____ measured by EQ tests, might actually matter more than their IQ.

查看答案和解析>>

科目:高中英語 來源:2017屆河北定州中學高三上期周練英語試卷(解析版) 題型:單項填空

Pandas are rare animals close to ___________. They have now been listed among the world’s most endangered wildlife animals.

A. extinction, B. emergence

C. intension D. disappearance

查看答案和解析>>

同步練習冊答案