D

A buld-it-yourself solar still（蒸餾器） is one of the best ways to obtain drinking water in areas where the liquid is not readily available. Developed by two doctors in the U.S. Department of Agriculture, it’s an excellent water collector. Unfortunately, you must carry the necessary equipment with you, since it’s all but impossible to find natural substitutes. The only components required, though, are a 5’ 5’ sheet of clear or slightly milky plastic, six feet of plastic tube, and a container— perhaps just a drinking cup — to catch the water. These pieces can be folded into a neat little pack and fastened on your belt.

To construct a working still, use a sharp stick or rock to dig a hole four feet across and three feet deep. Try to make the hole in a damp area to increase the water catcher’s productivity. Place your cup in the deepest part of the hole. Then lay the tube in place so that one end rests all the way in the cup and the rest of the line runs up — and out — the side of the hole.

Next, cover the hole with the plastic sheet, securing the edges of the plastic with dirt and weighting the sheet’s center down with a rock. The plastic should now form a cone(圓錐體) with 45-degree-angled sides. The low point of the sheet must be centered directly over, and no more than three inches above, the cup.

The solar still works by creating a greenhouse under the plastic. Ground water evaporates (蒸發(fā)) and collects on the sheet until small drops of water form, run down the material and fall off into the cup. When the container is full, you can suck the refreshment out through the tube, and won’t have to break down the still every time you need a drink.

1.What do we know about the solar still equipment from the first paragraph?

A.It’s delicate. B.It’s expensive.

C.It’s complex. D.It’s portable

2.What does the underlined phrase “the water catcher” in paragraph 2 refer to?

A.The tube B.The still

C.The hole D.The cup

3.What’s the last step of constructing a working solar still?

A.Dig a hole of a certain size B.Put the cup in place

C.Weight the sheet’s center down D.Cover the hole with the plastic sheet

4.When a solar still works, drops of water come into the cup form .

A.the plastic tube B.outside the hole

C.the open air D.beneath the sheet

練習冊系列答案
相關(guān)習題

科目：高中英語 來源：甘肅省天水市2016-2017學年高二下學期第二學段考試英語試卷 Word版含答案 題型：單詞拼寫

Xie lei's 1. course is helping her to get used to the 2.requirements of a Western university. "I remember the first 3. I did for my tutor." she told me. I found an article on the Internet 4. seemed to have exactly the information I needed. So I made a summary of the article, 5. my draft and handed the essay in.

In the 18th century California was 6.by Spain.Spanish soldiers first arrived in South America in the early 16th century,when they fought against the native people and took their land.Two centuries later,the Spanish 7.in most parts of South America and along the northwest coast of 8.we now call the United States.

Cloning plants is 9.while cloning animals is very complicated.It is a difficult task to undertake.Many10.to clone mammals failed.

查看答案和解析>>

科目：高中英語 來源：2017年全國普通高等學校招生統(tǒng)一考試英語（江蘇卷正式版） 題型：閱讀理解

C

A new commodity brings about a highly profitable, fast-growing industry,urging antitrust（反壟斷）regulators to step in to check those who control its flow. A century ago, the resource in question was oil. Now similar concerns ares being raised by the giants（巨頭）that deal in data, the oil of the digital age. The most valuable firms are Google, Amazon, Facebook and Microsoft. All look unstoppable.

Such situations have led to calls for the tech giants to be broken up. But size alone is not a crime. The giants’ success has benefited consumers. Few want to live without search engines or a quick delivery. Far from charging consumers high prices, many of these services are free (users pay, in effect, by handing over yet more data). And the appearance of new-born giants suggests that newcomers can make waves, too.

But there is cause for concern. The internet has made data abundant, all-present and far more valuable, changing the nature of data and competition. Google initially used the data collected from users to target advertising better. But recently it has discovered that data can be turned into new services: translation and visual recognition, to be sold to other companies. Internet companies’ control of data gives them enormous power. So they have a “God’s eye view” of activities in their own markets and beyond.

This nature of data makes the antitrust measures of the past less useful. Breaking up firms like Google into five small ones would not stop remaking themselves: in time, one of them would become great again. A rethink is required—and as a new approach starts to become apparent, two ideas stand out.

The first is that antitrust authorities need to move form the industrial age into the 21st century. When considering a merger(兼并), for example, they have traditionally used size to determine when to step in. They now need to take into account the extent of firms'data assets(資產(chǎn)) when assessing the impact of deals. The purchase price could also be a signal that an established company is buying a new-born threat. When this takes place, especially when a new-born company has no revenue to speak of, the regulators should raise red flags.

The second principle is to loosen the control that providers of on-line services have over data and give more to those who supply them. Companies could be forced to consumers what information they hold and how many money they make form it. Govemments could order the sharing of certain kinds of data, with users' consent.

Restarting antitrust for the information age will not be easy But if govemments don't wants a data oconomy by a few giants, they must act soon.

1.Why is there a call to break up giants?

A. They have controlled the data market

B. They collect enormous private data

C. They no longer provide free services

D. They dismissed some new-born giants

2.What does the technological innovation in Paragraph 3 indicate?

A. Data giants’ technology is very expensive

B. Google’s idea is popular among data firms

C. Data can strengthen giants’ controlling position

D. Data can be turned into new services or products

3.By paying attention to firms’ data assets, antitrust regulators could .

A. kill a new threat B. avoid the size trap

C. favour bigger firms D. charge higher prices

4.What is the purpose of loosening the giants’ control of data?

A. Big companies could relieve data security pressure.

B. Governments could relieve their financial pressure.

C. Consumers could better protect their privacy.

D. Small companies could get more opportunities.

查看答案和解析>>

科目：高中英語 來源：2017年全國普通高等學校招生統(tǒng)一考試英語（江蘇卷正式版） 題型：單項填空

__________not for the support of the teachers,the student could not overcome her difficulty.

A.It were B.Were it C. It was D. Was it

查看答案和解析>>

科目：高中英語 來源：2017年全國普通高等學校招生統(tǒng)一考試英語（全國1卷正式版） 題型：書面表達

假定你是李華，正在教你的英國朋友Leslie學習漢語。請你寫封郵件告知下次上課的計劃。內(nèi)容包括：

（1）時間和地點；

（2）內(nèi)容：學習唐詩；

（3）課前準備：簡要了解唐朝的歷史。

注意：

1.詞數(shù)100左右；

2.可以適當增加細節(jié)，以使行文連貫。

查看答案和解析>>

科目：高中英語 來源：湖北省襄陽市2017屆高三下學期第二次模擬考試英語試卷 題型：短文改錯

假定英語課上老師要求同桌之間交換修改作文，請你修改你同桌寫的以下作文。文中共有10處語言錯誤，每句中最多有兩處。每處錯誤僅涉及一個單詞的增加、刪除或修改。

增加：在缺詞處加一個漏字符號(∧)，并在其下面寫出該加的詞。

刪除：把多余的詞用斜線(＼)劃掉。

修改：在錯的詞下劃一橫線，并在該詞下面寫出修改后的詞。

注意：1．每處錯誤及其修改均僅限一詞；

2．只允許修改10處，多者(從第11處起)不計分。

Dear Peter,

How times flies! It had been almost a year since you left China to Sweden. During your home stay at my home, we had such wonderful time that it seemed as if everything had been happened yesterday. I have been long to hear all about you and missing you so much. Fortunate, I was selected as one of the student representative to pay a visit to your school. The visit will last on July 7th to 20th. And as a super soccer fan, I’d really love to visit our local soccer club.

I can’t wait for the day to come where I can see you.

Yours,

Li Hua

查看答案和解析>>

科目：高中英語 來源：湖北省襄陽市2017屆高三下學期第二次模擬考試英語試卷 題型：閱讀理解

Rocky Mountain Summer Adventure Camps Bring Learning to Life!

The Museum of Idaho Rocky Mountain Adventure Camps are available for students aged 6-14. Participants will have amazing outdoor experiences combined with adventure and fun. Space is limited to 20participants each session and registration is not complete until payment has been received by the Museum of Idaho. Registration fee is non-returnable.

Junior Adventure Camp

Children aged 6-9 (must have completed first grade).

Well conduct experiments, go on field trips, and discover the fun and excitement of science! This year, we will learn about colonial（殖民主義的）science to go along with our exhibit, America’s Revolution!

Instructor: Chloe Doucette

Dates: June 27- June30

Time: 9:00 a.m. - noon

Cost: $75 per child, $60 per child for MOI members, $50 each additional brother or   sister

Original Camp

Children aged 9-12 (must have completed third grade)

Original Camp is for children who are ready for an exciting full-day outdoor camp. Participants visit various habitats and ecosystems as we explore eastern Idaho. Well go bird watching, hiking in the mountains, and lots more!

Instructors: Alana Jensen, Jerry Petty

Dates: July 18- July21

Time: 9:00 a.m.  4:00 p.m.(9:00-6:00 on the last day)

Cost: $150 per child, $125 per child for MOI members, $100 each additional brother or sister

High Adventure Camp

Youth aged 11-14 (must have completed fifth grade)

High Adventure Camp is for youth who are looking for an amazing summer adventure! This outdoor camp is full of exciting physical challenges and involves participants in even more in-depth activities than the Original Camp. This year, students will study how rattlesnakes experience the outdoors!

Instructors: Chloe Doucette, Mike Winston, Jerry Petty

Dates: August 8- August 11

Time: 9:00 a.m.  4:00 p.m.(9:00  6:00 on the last day)

Cost: $150 per child, $125 per child for MOI members, $100 each additional brother or sister

Participate in both Original AND High Adventure for only $200! Call522-1400 ext. 3002 to take advantage of this great offer. If you have any questions about the Museum of Idaho’s education programs, contact Chloe Doucette, Education Director at (208) 522-1400 ext.3002.

1.If participants want to register successfully, they need to _________.

A. choose their favorite instructors

B. make up a team of 20 participants

C. be accompanied by family

D. pay for the fee ahead of time

2.To make experiments, what will a 9-year-old boy choose?

A. Original Camp. B. Junior Adventure Camp.

C. High Adventure Camp. D. Three of them.

3.How much will a child and his brother spend at least if they sign up for both Original and High Adventure Camp?

A. $400. B. $450.

C. $500. D. $550.

查看答案和解析>>

科目：高中英語 來源：湖南省長沙市2017屆高三高考模擬試卷（二）英語試卷 題型：閱讀理解

We’d arrived at Rockefeller Center station on the D train. As in many of New York’s underground stations, trains pull in at both sides of the platform. Or rather, they seem to erupt into the station first on one side, then on the other.

Abruptly, my wife stopped.

“Uh, what’s this?” she said.

I looked over her shoulder. There at our feet lay a young woman of about 20. She was on her stomach with the top half of her body on the platform, while her legs hung over the tracks kicking powerlessly.

She was stuck. She had also, clearly, been down on the tracks and discovered that climbing back up is really hard.

But unlike in our imaginings, this woman was not in panic, expecting her approaching death by the F train which would be screaming into the station in the next few minutes, if not seconds.

She was laughing! So was her friend who half-heartedly leant down to assist. The assistance was somewhat weakened by the fact that the friend was holding her smartphone. Was she hoping to capture this moment with a picture? Or composing a text?

It’s well known that people’s compulsive checking of their phones can be deadly. Among young people in America, texting is now the number one cause of car crashes. Maybe it’s also a leading cause of leaving friends to die when they fall in the river or on to the train tracks.

I stepped forward, leant out as far as I could, got hold of her leg somewhere near the knee and, together with her finally-engaged friend, dragged the young woman on to the platform.

And you can guess why she'd been on the tracks. Still laughing, but maybe chastened (內(nèi)疚）by my look of horror she said, “Thanks. Sorry. My phone fell down there. ”

While I turned to hold my daughter’s hand and head upstairs, the young woman and her friend walked away. I wonder when she'll be scared.

1.What was the young woman doing on the edge of the platform?

A. Trying to get down on to the train tracks to pick up her phone.

B. Trying to get back on to the platform after jumping down.

C. Desperately waiting for someone to help her get back her phone.

D. Posing for her friend to capture a good picture with her smartphone.

2.Which of the following did the author think was NOT a cause of the young woman’s dangerous situation?

A. The station was too crowded.

B. She did not realize the danger.

C. She cared too much about her phone.

D. Her company didn't assist her whole-heartedly.

3.What was the author’s worry about people like this young woman?

A. They would cause damage to the underground system.

B. They knew too little about how to help others as well as themselves.

C. It would be too late when they understood how dangerous the situation is.

D. They would send misleading information to the public with their smartphones.

查看答案和解析>>

科目：高中英語 來源：2017年全國普通高等學校招生統(tǒng)一考試一英語（全國卷3正式版） 題型：短文填空

She looks like any other schoolgirl, fresh-faced and full of life. Sarah Thomas is looking forward to challenge of her new A-level course .But unlike school friends ,16-year-old Sarah is not spending half-term 【題文1】 (real)Instead, she is earning $6500 a day as 【題文2】 model in New York.

Sarah 【題文3】 (tell) that she could be Britain’s new supermodel earning a million dollars in the new year. Her father Peter44,want her to give up school to model fulltime But Sarah, 【題文4】 has taken part in shows along with top models wants 【題文5】 (prove) that she has brains as well as beauty she is determined to carry on with her 【題文6】 (educate).

She has turned down several 【題文7】 (invitation) to star at shows in order to concentrate on her studies After school she plans to take a year off to model full time before going to university to get a degree 【題文8】 engineering or architecture.

Sarah says, "My dad thinks I should take the offer now. But at the moment, school 【題文9】 (come) first. I don't want to get too absorbed in modeling. It is 【題文10】 (certain) fun but the lifestyle is a little unreal. I don't want to have nothing else to fall back on when I can't model my more."

查看答案和解析>>

同步練習冊答案