Dolphins(海豚) live in a dark underwater world. It’s often impossible to see each other or anything else around them, so sound plays an important role in their survival. To communicate with each other, dolphins produce all kinds of sounds.

Only other dolphins understand what the sounds mean. Scientists haven’t uncovered their secret communication, except for one kind of whistle. It might last less than a second, but this whistle is a big deal. Why? Because these whistles are actually names of dolphins - and every dolphin has one. Scientists call these sounds a “signature whistle.” When other dolphins hear the whistle, they know which dolphin is calling.

Dolphins often hunt by themselves but still need to stay connected to the group. Since they can’t always see each other, dolphins use their signature whistles to check in with other dolphins hundreds of yards away. “In coastal areas, dolphins exchange whistles even when they’re a third of a mile apart,” says Greg Campbell, who studies animals. That means dolphins shout out to group members that might be nearly five football fields away.

What’s amazing is who names the baby dolphin. Not the mother. Not an auntie dolphin or another group member. Scientists believe the baby dolphin itself comes up with the signature whistle. Like human babies, a baby dolphin plays with sounds throughout its first year. While testing its sound skills, a baby dolphin is doing something amazing. It’s creating or figuring out its signature whistle. How or why it chooses its signature whistle is not clear. Studies show that most of the time the signature whistle is nothing like its mother’s or group members’ whistles.

When the baby dolphin is about a year old, its signature whistle is set. It repeats it often so the other dolphins learn to recognize it.

Deciphering(破譯) dolphin names is just the beginning of figuring out what dolphins communicate about. Do they chat about sharks? Discuss the tides? Maybe they even have a name for people. Someday scientists are to decipher the rest of dolphins’ communication.

1.Sound is important for dolphins because of ______.

A．their poor sense of direction

B．their living environment

C．their strong enemies

D．their big groups

2.The dolphin’s signature whistle ______.

A．lasts along time

B．can travel long distances

C．is especially helpful in hunting

D．can be recognized by other animals

3.The author writes the text mainly to _____.

A．encourage readers to study dolphins

B．tell readers how dolphins communicate

C．show how lovely and clever dolphins are

D．introduce a special sound made by dolphins

4.A baby dolphin gets its name ______.

A．soon after it was born B．a(chǎn)ccording to its size

C．a(chǎn)ll by itself D．with the help of its group

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語(yǔ) 來(lái)源：2015-2016學(xué)年河北邢臺(tái)市高二上第二次月考英語(yǔ)試卷（解析版） 題型：閱讀理解

Shopping for clothes is not the same experience for a man as it is for a woman. A man goes shopping because he needs something. His purpose is settled and decided in advance. He knows what he wants, and his objective is to find it and buy it; the price is a secondary consideration. All men simply walk into a shop and ask the assistant for what they want. If the shop has it in stock, the salesman promptly produces it, and the business of trying it on goes forward at once. All being well, the deal can be and often is completed in less than five minutes, with hardly any chat and to everyone's satisfaction. For a man, slight problems may begin when the shop does not have what he wants, or does not have exactly what he wants. In that case the salesman, as the name implies, tries to sell the customer something else, he offers the nearest he can to the article required. No good salesman brings out such a substitute without least consideration; he does so with skill and polish（完美）: “I know this jacket is not the style you want, sir, but would you like to try it for size. It happens to be the color you mentioned." Few men have patience with this treatment, and the usual response is: “This is the right color and may be the right size but I should be wasting my time and yours by trying it on.

Now how does a woman go about buying clothes? In almost every respect she does so in the opposite way. Her shopping is not often based on need. She has never fully made up her mind what she wants, and she is only “having a look round". She is always open to persuasion: indeed she sets great store by what the saleswoman tells her, even by what companions tell her. She will try on any number of things. Uppermost in her mind is the thought of finding something that everyone thinks suits her. Contrary to a lot of jokes, most women have an excellent sense of value when they buy clothes. They are always on the lookout for the unexpected bargain. Faced with a roomful of dresses, a woman may easily spend an hour going from one rail to another, to and fro often retracing her steps, before selecting the dresses she wants to try on. It is a tiresome process, but apparently an enjoyable one. Most dress shops provide chairs for the waiting husbands.

1.According to the passage, a man’s shopping is based on _______.

A. his money B. his hobbies

C. his need D. his friends

2.Why does a lady welcome suggestions from anyone while buying a dress?

A. Because she wants to buy a dress that every one thinks suits her.

B. Because she doesn’t know how to buy a dress.

C. Because she doesn’t know whether to buy it or not.

D. Because she wants to show herself off in public.

3.Which of the following statements is TRUE according to the passage?

A. Most men have patience with trying it on while buying a jacket.

B. Most women have a poor sense of value when buying a dress.

C. A woman’s shopping is based on her need.

D. A man doesn’t pay much attention to the price of the clothes he wants to buy.

4.The passage mainly talks about the ______ between men shoppers and women shoppers for clothes.

A. similarities B. differences

C. varieties D. Intentions

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2016屆山西省四校高三上學(xué)期第二次聯(lián)考英語(yǔ)試卷（解析版） 題型：閱讀理解

A lot of people say math is not their strong suit. One New Jersey parent wants to help change that. Laura Overdeck grew up with numbers. She always helped measure ingredients when her mother baked, and she learned about angles from her father. She went on to major in astrophysics in college. Overdeck knew she wanted her own children to be good at math, too.

“And when our first child was about two, we just started giving her a math problem every night,” Overdeck said. The problem was usually a story, involving animals, cars or candies that let the kid count. “Our third child started, at age two, yelling that he wanted his own math problem because he saw his brother and sister doing it. And we thought, ‘Wow, we have a household where math is the popular thing at bedtime,’” Overdeck said.

In February, Overdeck launched Bedtime Math, an Internet website where she posts daily puzzles for children. Overdeck is particularly keen to hook children on numbers before they go to school. So why introduce little ones to math so early?

Sain Beilock, an expert on performance anxiety, says the more fun and familiar math is early on, the less likely children will feel nervous when they start to learn math in school. “My lab has shown recently that kids as early as first grade report feeling anxious about doing math,” Beilock said.

“You can hear totally educated adults say, ‘You know I’m just not that good at math.’ or ‘I’m kind of afraid of math.’ And that’s a totally acceptable thing for a well-educated person to say, but you never hear them say, ‘Well, you know, I’m just not that good at reading,’” Overdeck said. She wants children and their parents to become as fluent in numbers as they are in Harry Potter.

1.Overdeck majored in astrophysics because she _______.

A. was really fond of mathematics

B. hoped to change math education in the US

C. had an interest in physics

D. would like her children to be good at math

2.What can be inferred from Paragraph 2?

A. Toys can be used to encourage kids in solving math problems.

B. Math will become more popular in every household.

C. Math is enjoyable in Overdeck’s family.

D. The third child is cleverer than his brother and sister.

3.Beilock’s attitude towards Overdeck’s idea is _______.

A. agreeable B. puzzled

C. anxious D. critical

4.The unfavorable situation of the US in math ability is shown by _______.

A. the popularity of Bedtime Math

B. children’s performance anxiety in school

C. people’s response to math

D. adults’ great fondness for Harry Potter

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2016屆江蘇省常州市兩校高三聯(lián)考英語(yǔ)試卷（解析版） 題型：單項(xiàng)填空

—I just can’t believe that Ella the cat has left me forever.

— ______ and cry. Don’t hold it in.

A. Don’t worry B. Go ahead

C. Forget it D. Help yourself

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2016屆江蘇省常州市兩校高三聯(lián)考英語(yǔ)試卷（解析版） 題型：單項(xiàng)填空

While previous Chinese series which have gained popularity abroad have been mostly ______ from Chinese classics , such as The Romance of the Three Kingdoms and Journey to the West, Nirvana in Fire, or Langya Bang, is different.

A. adopted B. harvested C. recognized D. adapted

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2016屆河北衡水第二中學(xué)高三上學(xué)期期中英語(yǔ)試卷（解析版） 題型：閱讀理解

The bed should be reserved as a place for sleep, but people tend to read an iPad a lot in bed before they go to sleep.

Charles Czeisler, a professor at Harvard Medical School, and his colleagues got a small group of people for an experiment. For five days in a row, the people read either a paper book or an iPad for four hours before sleep. Their sleep patterns were monitored all night. Before and after each trial period, the people took hourly blood tests to paint a day-long picture of just how much melatonin (褪黑激素) was in their blood at any given time.

When subjects read on the iPad as compared to the paper books, they reported feeling less sleepy at night and less active the following morning. People also took longer to fall asleep on the iPad nights, and the blood tests showed that their melatonin secretion (分泌) was delayed by an hour and a half.

The researchers conclude in today's journal article that given the rise of e-readers and the increasingly widespread use of e-things among children and adolescents, more research into the long-term consequences of these devices on health and safety is urgently needed. Czeisler and colleagues go on, in the research paper, to note：“Reading an iPad in bed may increase cancer risk.”

However, software has been developed that can reduce some of the blue light from the screens of phones and computers according to time of day, and there are also glasses that are made to filter (過(guò)濾) short wavelengths. While they seem like a logical solution for the nighttime tech users, it needs more research.

1.In Charles Czeislers experiment, all the subjects were asked to______.

A. sit in a row and receive the strict tests

B. have their sleep patterns observed all night

C. read a paper book and an iPad at the same time

D. have their blood tested per hour during the trial

2.The third paragraph tells us the iPad readers were likely to____________.

A. feel less sleepy and tired in the day

B. fall asleep more easily after reading

C. become less energetic the next morning

D. have a lot more melatonin secretion

3.The special software recently developed can______.

A. remove the blue light from your devices completely

B. help prevent eyes being harmed by short wavelength

C. weaken the harm done by doing nighttime e-reading

D. be used in all the e-things widely and safely

4.Which of the following can be the best title for the text?

A. No e-reading in bed before sleep

B. New software for night e-readers

C. Wrong behaviors before bedtime

D. No games on iPad in bed

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2016屆甘肅天水第一中學(xué)高三普通班上第三次考英語(yǔ)試卷（解析版） 題型：閱讀理解

It’s summer movie time again. Check out our list of four films.

Harry Potter and the Prisoner of Azkaban

Release Date: November 4

Story: It’s the summer before Harry Potter’s third year at Hogwarts School of Witchcraft and Wizardry. A dangerous murderer, Sirius Black, has escaped from the Wizards’ Prison. And he was ordered to kill Harry Potter.

Around the World in 80 Days

Release Date: November 16

Story: This version of the classic novel set in 1872 focuses on Passepartout ( Hong Kong actor Jackie Chan), a Chinese thief who seeks refuge (庇護(hù)) with a strange London adventurer, Phileas Fogg. Passepartout uses his martial art skills(軍事技能) to defend Fogg from danger as he travels around the world in 80 days.

Spider-Man 2

Release Date: November 30

Story: Peter Parker is still coming to accept his dual identity (雙重身份) as the crime superhero Spider-Man. He wants to reveal his secret identity to Mary Jane, meanwhile, his Aunt May is in trouble. This is Dr Otto Octavius who has appeared to bring her a lot of troubles.

King Arthur

Release Date: November 7

Story: King Arthur is presented as a clever ruler who manages to unite all the knights in Britain. Under the guidance of Merlin and the beautiful, brave Guinevere, Arthur will struggle to realize his dreams.

1.When can you see the film acted by Jackie Chan?

A. November 4 B. November 30

C. November 16. D. November 7.

2.In Spider-Man 2, Aunt May’s trouble is caused by______.

A. Spider-Man B. Peter Parker

C. Mary Jane D. Dr Otto Octavius

3.What kind of article of this passage?

A. A news report B. A funny diary.

C. An advertisement. D. A composition.

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2015-2016學(xué)年浙江杭州第二中學(xué)高二上學(xué)期期中英語(yǔ)試卷（解析版） 題型：單項(xiàng)填空

Uber (優(yōu)步) is the easiest way to connect you with a driver_________ the tap of a button. In terms of price and convenience, it is second _________ none.

A. with; against B. at; to

C. through; for D. by; beyond

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2015-2016學(xué)年廣西桂林第十八中學(xué)高一上期中英語(yǔ)試卷（解析版） 題型：單詞拼寫(xiě)

單詞拼寫(xiě)

1.For three days the water in the village wells _____(上升) and fell.

2.The dead body of a person used to be ______(埋葬) under the earth.

3.It’s not _____(可靠的) to judge a man only by his looks.

4.He has eight _____(律師) to help him and they examines every letter carefully.

5.The lift was out of order and two persons were ______(使陷入困境) in it.

6.A _____(系列) of events happened recently in our city.

7.I have got a very full ______(時(shí)間表，日程表) today.

8.Tom prefers reading ______ talking.

9.It is I who _____(be) going to help you.

10.He asked me if I had any trouble _____ my English.

11.The smoke made the room ______(dirt).

12.He has devoted his whole life to _____(write).

13.The boss to ______ Mary turned for help is a kind man.

14.The building ______ stands by the river is our school.

15.The days are gone _____ the working people suffered from cold and hunger.

查看答案和解析>>

同步練習(xí)冊(cè)答案