An annoying problem for humans, who like to boast (夸耀) about all the distant planets and moons we have explored, is that we've never taken a good look right under our noses．The inside of the earth is relatively close but how can we get there?
The deepest oil well enters a mere six miles into the crust (地殼) (the center of the earth is about 4,000 miles deeper)．Russian scientists dug the deepest hole in Siberia," but bottomed out at about 7.5 miles below the surface．The Mohole project, a U.S．plan in the 1950s, called for drilling a hole 25 miles down to the boundary be??tween the hard rocks of the crust and the soft mantle (地幔)．Sadly the project involved govern??ment supporting.
It gets harder and harder to drill deep into the earth because rocks get softer and softer． Hard but easily broken at the surface, rocks become plastic at depth, and the pressure caused by the weight of the overlaying crust — about 52,800 pounds per square inch at a depth of ten miles, makes further drilling impossible.
What little we know about the inside of the earth (like the fact that there' s a crust, a mantle, and a core) comes from indirect evidence, such as the analysis of earthquakes.
So maybe it' s time for a thorough new method to explore the earth's inside．Scientist David Stevenson says we should forget about drilling holes．Instead, we should open a crack (裂縫)．
Stevenson suggests digging a crack about a half mile long, a yard wide, and a half mile deep (not with a shovel) but with an explosion on the scale of a nuclear bomb．Next, he'd pour a few hundred thousand tons of molten (融化的) iron into the crack, along with a robot．The iron, thicker than the surrounding crust, would move downward at about 16 feet per second, carrying the robot with it and opening the crack deeper and deeper．The iron mass would drop for about a week and 2,000 miles to the outer edge of the earth core, the robot sending out data to the sur??face.
Stevenson compares his idea to space explo??ration．"We're going somewhere we haven't been before," he says．"In all possibility, there will be surprises."
This idea can probably be put in．the drawer marked with Isn't Going To Happen．The robot would have to survive temperatures that would melt pretty much anything．But Stevenson's idea may inspire a new look at an old problem．Great things can come from what seems like impossible ideas.
Going inside the earth is ________ than going into space.
A．more interesting B．more possible C．easier D．more challenging
How deep have we gone into the earth until now?
A．6 miles． B．4,000 miles． C．7.5 miles． D．25 miles.
Which of the following is TRUE about David Stevenson's idea?
A．It is an inspiring but not practical idea now．
B．It is a practical proposal that has come into use now.
C．It is a good proposal that will soon be put into practice.
D．It is a false theory that cannot be carried out at all.
What might be the most suitable title for the text?
A．An Annoying Problem for Humans
B．To the Center of the Earth
C．The Mohole Project
D．David Stevenson' s Proposal
同步練習(xí)河南大學(xué)出版社系列答案
同步練習(xí)西南大學(xué)出版社系列答案
補(bǔ)充習(xí)題江蘇系列答案
學(xué)練快車道口算心算速算天天練系列答案
| 年級(jí) | 高中課程 | 年級(jí) | 初中課程 |
| 高一 | 高一免費(fèi)課程推薦！ | 初一 | 初一免費(fèi)課程推薦！ |
| 高二 | 高二免費(fèi)課程推薦！ | 初二 | 初二免費(fèi)課程推薦！ |
| 高三 | 高三免費(fèi)課程推薦！ | 初三 | 初三免費(fèi)課程推薦！ |
科目：高中英語(yǔ) 來(lái)源：2012-2013學(xué)年重慶市三峽名校聯(lián)盟高一下學(xué)期期中考試英語(yǔ)試卷（帶解析） 題型：閱讀理解
As we get older, most of us worry about grey hair, wrinkles and maintaining a youthful body. But people often don’t realize the voice needs looking after. Here, Mr. Rubin, a voice expert, reveals how to keep your voice youthful.
Drink more fluid and avoid spicy food
You need water for the vocal cords(聲帶) to vibrate(振動(dòng)) well. The body must be kept hydrated enough to make the vocal cords operate well. Drinking 1.5 liters of water a day at intervals of 15 minutes is very important. Mr. Rubin advises avoiding foods with an annoying effect on the stomach, such as onions, chili, fizzy drinks and chocolate.
Rest the throat and talk regularly
The vocal cords can be scared if you use your voice during a bad cough. If you have a case of laryngitis(喉炎) with a cold, you should rest your voice for a day or two, and seek medical advice.
Simply staying sociable and using your voice is very important. “As older people get less mobile, they can become socially isolated and speak less.” says Mr. Rubin. “The elderly need to communicate with people more. By using the vocal cords, they enable the ageing process to slow down. ”
Improve your posture
Good posture is essential to keeping the voice young, so we’d better stand properly. Exercise helps you take deeper breaths as it means there is better airflow through the voice box, producing a stronger tone.
Sing in the shower
This is one of the best ways to preserve your voice, as it keeps the larynx muscles strong while the steam lubricates(使?jié)櫥? the voice box. “Singing is gymnastics for the voice,” says Mr. Rubin. Joining a choir is one of the best ways to preserve a youthful tone.
【小題1】Mr. Rubin gives us advice on ________.
| A．ways to keep us from aging |
| B．ways to talk with other people |
| C．ways to keep our voice youthful |
| D．prevention of diseases caused by talking too much |
| A．We should stand properly to keep our voice youthful. |
| B．Professional singers’ voices tend to age quickly. |
| C．The steam can do great harm to the voice. |
| D．Taking more onions can keep us healthy. |
| A．get less mobile | B．communicate with others more |
| C．a(chǎn)void using the voice | D．lie in bed more |
| A．Most people have realized the importance of protecting voice. |
| B．It’s hard to keep the vocal cords strong through exercise. |
| C．Singing in the shower is among the best ways to keep our voice youthful. |
| D．Shouting now and then benefits our vocal cords. |
查看答案和解析>>
科目：高中英語(yǔ) 來(lái)源：2015屆重慶市三峽名校聯(lián)盟高一下學(xué)期期中考試英語(yǔ)試卷（解析版） 題型：閱讀理解
As we get older, most of us worry about grey hair, wrinkles and maintaining a youthful body. But people often don’t realize the voice needs looking after. Here, Mr. Rubin, a voice expert, reveals how to keep your voice youthful.
Drink more fluid and avoid spicy food
You need water for the vocal cords(聲帶) to vibrate(振動(dòng)) well. The body must be kept hydrated enough to make the vocal cords operate well. Drinking 1.5 liters of water a day at intervals of 15 minutes is very important. Mr. Rubin advises avoiding foods with an annoying effect on the stomach, such as onions, chili, fizzy drinks and chocolate.
Rest the throat and talk regularly
The vocal cords can be scared if you use your voice during a bad cough. If you have a case of laryngitis(喉炎) with a cold, you should rest your voice for a day or two, and seek medical advice.
Simply staying sociable and using your voice is very important. “As older people get less mobile, they can become socially isolated and speak less.” says Mr. Rubin. “The elderly need to communicate with people more. By using the vocal cords, they enable the ageing process to slow down. ”
Improve your posture
Good posture is essential to keeping the voice young, so we’d better stand properly. Exercise helps you take deeper breaths as it means there is better airflow through the voice box, producing a stronger tone.
Sing in the shower
This is one of the best ways to preserve your voice, as it keeps the larynx muscles strong while the steam lubricates(使?jié)櫥? the voice box. “Singing is gymnastics for the voice,” says Mr. Rubin. Joining a choir is one of the best ways to preserve a youthful tone.
1.Mr. Rubin gives us advice on ________.
A．ways to keep us from aging
B．ways to talk with other people
C．ways to keep our voice youthful
D．prevention of diseases caused by talking too much
2.Which of the following statements is TRUE in the opinion of Mr. Rubin?
A．We should stand properly to keep our voice youthful.
B．Professional singers’ voices tend to age quickly.
C．The steam can do great harm to the voice.
D．Taking more onions can keep us healthy.
3.To protect the voice, the old people should .
A．get less mobile B．communicate with others more
C．a(chǎn)void using the voice D．lie in bed more
4.What can we learn from the text?
A．Most people have realized the importance of protecting voice.
B．It’s hard to keep the vocal cords strong through exercise.
C．Singing in the shower is among the best ways to keep our voice youthful.
D．Shouting now and then benefits our vocal cords.
查看答案和解析>>
科目：高中英語(yǔ) 來(lái)源：2015屆江蘇省高一上學(xué)期期中考試英語(yǔ)試卷（解析版） 題型：閱讀理解
It was the first snow of winter — an exciting day for every child but not for most teachers. Up until now, I had been able to dress myself for recess(課間休息), but today I would need some help. Miss Finlayson, my kindergarten teacher, had been through first snow days many times in her long career, but I think she may still remember this one.
I managed to get into my wool snow pants. But I struggled with my jacket because it didn’t fit well. It was a hand-me-down from my brother, and it made me wonder why I had to wear his ugly clothes. At least my hat and matching scarf(圍巾) were mine, and they were quite pretty. Finally it was time to have Miss Finlayson help me with my boots(靴子). In her calm, motherly voice she said, "By the end of winter, you will be able to put on your own boots.” I didn’t realize at the time that this was more a statement of hope than of confidence.
I handed her my boots and stuck out my foot. Like most children, I expected the adult to do all the work. After much wiggling and pushing, she managed to get first one into place and then, with a sigh, worked the second one on too.
I announced，“They’re on the wrong feet.” With the grace that only experience can bring，she struggled to get the boots off and went through the joyless task of putting them on again. Then I said，“These aren’t my boots, you know.” As she pulled the offending boots from my feet, she still managed to look both helpful and interested. Once they were off, I said，“They are my brother’s boots. My mother makes me wear them, and I hate them!” Somehow, from long years of practice, she managed to act as though I wasn’t an annoying(煩人的) little girl．She pushed and shoved, less gently this time, and the boots were returned to their proper place on my feet. With a great sigh of relief, seeing the end of her struggle with me, she asked, “Now, where are your gloves?’’
I looked into her eyes and said, “I didn’t want to lose them, so I put them into the toes of my boots.”
1.According to the passage, the little girl got_______from her brother.
|
A．the wool snow pants and the jacket |
|
B．the jacket and the boots |
|
C．the jacket and the hat |
|
D．the boots and the gloves |
2.Why does the author say Miss Finlayson would remember that first snow day?
|
A．Because the little girl played a trick on her. |
|
B．Because it was the most exciting day of the winter. |
|
C．Because the little girl was in her brother’s clothes. |
|
D．Because the little girl wore a pretty scarf. |
3.We can learn from the text that Miss Finlayson_________.
|
A．was losing confidence in the little girl |
|
B．gradually lost patience with the little girl |
|
C．because disappointed with the little girl |
|
D．was getting bored with the little girl |
4.It can be inferred(推斷) that before the little girl finally went out to enjoy the first snow of winter，the teacher had to help her put on her boots __________.
|
A．once |
B．twice |
C．three times |
D．four times |
查看答案和解析>>
科目：高中英語(yǔ) 來(lái)源：2010-2011學(xué)年河北唐山一中高二9月份月考英語(yǔ)卷 題型：閱讀理解
It was the first snow of winter – an exciting day for every child but not for most teachers. Up until now, I had been old enough to dress myself, but today I would need some help. Miss Finlayson, my kindergarten teacher, had been through first snow days many times, but I think she may still remember this one.
I managed to get into my wool snow trousers. But I struggled with my jacket because it didn’t fit well. It was a hand-me-down from my brother, and it made me wonder why I had to wear his ugly clothes. At least my hat and scarf were mine, and they were quite pretty. Finally it was time to have Miss Finlayson help me with my boots (靴子).
In her calm, motherly voice she said, “By the end of winter, you will all be able to put on your own boots.” I didn’t realize at the time that this was more a statement of hope than of confidence (信心).
I handed her my boots and stuck out my foot. Like most children, I expected grown-ups to do all the work. After much pushing, she managed to get the first one into place and then, with a sigh, worked the second one on too.
I announced, “They’re on the wrong feet.”
She struggled to get the boots off and went through the joyless task of putting them on again.
“They’re my brother’s boots, you know,” I said. “I hate them!”
Somehow, from long years of practice, she managed to act as though I wasn’t an annoying (煩人的) little girl, She pushed and pushed, less gently this time. With a greater sigh, seeing the end of her struggle with me, she asked, “Now, where are your mittens (連指手套)?”
I looked into her eyes and said, “I didn’t want to lose them, so I hid them in the toes of my boots.”
1. The little girl was more satisfied with her_________.
A. trousers B. jacket C. boots D. hat
2.Miss Finlayson had difficulty with the girl’s boots mainly because________.
A. the girl got them from her brother B. the girl put something in them
C. they were on the wrong feet D. they did not fit the girl well
3.Why does the author say Miss Finlayson would remember that first snow day?
A. Because the little girl was in her brother’s clothes.
B. Because it was the most exciting day of the winter.
C. Because the little girl played a trick on her.
D. Because the little girl wore a pretty scarf.
4.We can learn from the text that Miss Finlayson_________.
A. was losing confidence in the little girl
B. gradually lost patience with the little girl
C. became disappointed with the little girl
D. was getting bored with the little girl
查看答案和解析>>
科目：高中英語(yǔ) 來(lái)源：2010年普通高等學(xué)校招生全國(guó)統(tǒng)一考試陜西卷英語(yǔ) 題型：閱讀理解
When I first got an email account ten years ago, I received communications only from family,friends,and colleagues.Now it seems that every time I check my e-mail ,I have an endless seriers of advertisement and otner correspondence that do not interest the at all.If we want e-mail to continue to be useful,we need special laws that make spamming(發(fā)送垃圾郵件) a crime.
If lawmakers do not do something soon to prohibit spam，the problem will certainly get much worse。Computer programs allow spammers to send hundreds of millions of e-mails almost instantly 。as more and more advertisers turn to spam to sell their products ，individual（個(gè)人的）e-mail boxes are often flooded with spam e-mails。Would people continue to use e-mail if they ahd to deal with an annoying amount of spam each time？
This problem is troubling for inviduals and companies as well. Many spam emails contain computer viruses that can shut down the entire network of a company.Companies rely on e-mail on on e-mail for their Comployees to communicate with each other. Spam frequently causes failures in their local commnications networks, and their employees are thus unable to communicate effectively.such a situationg results in a loss of productivity and requires companies to repeatedly repair their networks.These computer problems raise productton costs of companies ,which are,in the end,passed on to the consumer.
For these reasons,I believe that lawmakers need to legislate (立法) against spam.Spammers should be fined,and perhaps sent to prison if they continue to disturb people.E-mail is a tool which helps people all over the world to communicate conveniently,but spam is destroying this conwenience.
1.What does the underlined word “correspondence” in the Paragraph 1 probably mean?
A.messages B.ideas C.connections D.programs
2.According to the text, what is the major cause of the flooding spam?
A.Companies rely on e-mail for communications.
B.More people in the world communicate by e-mail.
C.Many computer viruses contain spam e-mail.
D.More advertisers begin to promote sales through spam.
3.According to Paragraph 3,who is the final victim of spam?
A. The business B. The advertiser
C.The employee D.The consumer
4.What is the purpose of the text?
A.To inform B.To educate C.To persuade D.To instruet
查看答案和解析>>
國(guó)際學(xué)校優(yōu)選 - 練習(xí)冊(cè)列表 - 試題列表
湖北省互聯(lián)網(wǎng)違法和不良信息舉報(bào)平臺(tái) | 網(wǎng)上有害信息舉報(bào)專區(qū) | 電信詐騙舉報(bào)專區(qū) | 涉歷史虛無(wú)主義有害信息舉報(bào)專區(qū) | 涉企侵權(quán)舉報(bào)專區(qū)
違法和不良信息舉報(bào)電話：027-86699610 舉報(bào)郵箱：58377363@163.com