首页 > 外语类考试> 在职申硕英语
题目内容 (请给出正确答案)
[主观题]

It's a classic mystery of the deep. Why does the hammerhead shark (双髻鲨)have the bizarre

It's a classic mystery of the deep. Why does the hammerhead shark (双髻鲨)have the bizarrely shaped head from which it gets its name?

There have been a variety of suggested explanations. Some simply say that the sharks use their heads to "hammer" and pin down their favourite food. More plausibly, others have speculated that the wide lobes(圆形突出部分)of the hammerhead allow it to have longer electrorecep-tots, the organs that all sharks use to detect the electric fields produced by nearby prey. This might allow hammerheads to sense subtler electric fields from more distant prey than their narrow-headed cousins.

Now it turns out that the shark's head does indeed help it find and capture prey, but not in the way that zoologists expected. Stephen Kajlura and Kim Holland of the University of Hawaii at Manoa set out to test the conventional theory by tricking young sharks into chasing phantom (虚构的)prey. Using a system of wires on the bottom of a shallow pool, they set up electric fields that mimicked those created by the bottom-dwelling shrimp and fish that form. the sharks' usual diet.

Sure enough, hungry sharks abruptly turned towards an electric field when they detected it. But when the researchers measured the distance at which this happened they found it was the same for 13 young hammerheads as it was for 12 young sandbar sharks(沙堤鲨),which have normal-shaped heads.

The two types of sharks proved equally adept at sensing the electric fields: each was able to detect the source from up to 30 centimetres away. That ruled out any improved sensitivity from the wider head. However, the hammerheads enjoy another more prosaic(平淡无奇的)advantage: their wider heads let them sweep more than twice as wide a swathe of the seafloor as they swim, which must boost their chance of encountering food.

The researchers also found that hammerheads could turn more sharply when they detected the phantom prey. "They're a much more bendy shark , "says Kajlura, who is now at the University of California at Irvine. In part, that's because they have more slender bodies than the sandbar sharks. However, Kajiura has other unpublished data that suggests that the hammerheads' broad heads can act as fins to improve manoeuvrability(机动性).

So far, the researchers have only experimented with young sharks, so adult hammerheads may gain some other advantage from their head shape.

The passage is mainly about ______.

A.the different species of sharks

B.the differences between hammerhead and sandbar sharks

C.how hammerhead sharks detect their prey

D.special functions of the hammerhead sharks

查看答案
答案
收藏
如果结果不匹配,请 联系老师 获取答案
您可能会需要:
您的账号:,可能还需要:
您的账号:
发送账号密码至手机
发送
安装优题宝APP,拍照搜题省时又省心!
更多“It's a classic mystery of the …”相关的问题
第1题
Mary McCarthy's satires are couched in a prose that has a classic precision.A.fusedB.prefa

Mary McCarthy's satires are couched in a prose that has a classic precision.

A.fused

B.prefaced

C.standardized

D.expressed

点击查看答案
第2题
Mary McCarthy’s satires are couched in a prose style. that has a classic precision.A.fused

Mary McCarthy’s satires are couched in a prose style. that has a classic precision.

A.fused

B.prefaced

C.standardized

D.expressed

点击查看答案
第3题
What does the man say about watching classic movies?A.It is helpful in practicing one"s pr

What does the man say about watching classic movies?

A.It is helpful in practicing one"s pronunciation.

B.It can make people relaxed.

C.It can enrich their college life.

D.It is the source of classic music.

点击查看答案
第4题
What are the two classic jobs that people will take in Rostock, besides working at McDonal
d's?

A.Becoming a physicist

B.Becoming a school teacher

C.Becoming a taxi driver

D.Becoming a magazine production manager

点击查看答案
第5题
The five classic foot positions in ballet are the basis for the ethereal grace of the ball
et dancer’s art.

A.balanced

B.traditional

C.disciplined

D.delicate

点击查看答案
第6题
The underlined word “deity” in the third paragraph refers to A.something myste

The underlined word “deity” in the third paragraph refers to

A.something mysterious.

B.the skin cancer.

C.the sun.

D.overexposure to the sun.

点击查看答案
第7题
What does the restoration of the Classic Coke best illustrate?A.Traditional goods have a s

What does the restoration of the Classic Coke best illustrate?

A.Traditional goods have a stronger appeal to the majority of people.

B.It takes time for a new product to be accepted by the public.

C.Consumers with conservative tastes are often difficult to please.

D.Products must he designed to suit the taste of the consumer.

点击查看答案
第8题
听力原文:These works of art are both elegant with classic simplicity and novel with stylis
h appeal, a fine example of combining the traditional culture with the world's fads and fashions.

______

点击查看答案
第9题
听力原文:In San Francisco there’s one hotel the world calls home.The Palace offers excelle
nt service.It has magnificent architecture,versatile mix of classic and ultra-modern meeting spaces.Let the warmth of the Palace capture your heart.For reservation,call 800—325—3535.

(19)

点击查看答案
第10题
In the author's opinion, 2001 was appealing because ______.A.Kubrick had a lot of money to

In the author's opinion, 2001 was appealing because ______.

A.Kubrick had a lot of money to direct this movie

B.the musical score was adapted mainly from classical compositions

C.visual effects were almost kaleidoscopic

D.the director utilized relatively inexpensive means like artistically combining spectacular camera work with classic music

点击查看答案
第11题
Which of the following sentence is not true?A.eMusic considers music curators to be import

Which of the following sentence is not true?

A.eMusic considers music curators to be important.

B.Pulitzer Prize is the highest award for classic music.

C.eMusic's MP3 file format doesn't involve copy protection technology.

D.The-new service makes eMusic have al most 12,500 subscribers.

点击查看答案
退出 登录/注册
发送账号至手机
密码将被重置
获取验证码
发送
温馨提示
该问题答案仅针对搜题卡用户开放,请点击购买搜题卡。
马上购买搜题卡
我已购买搜题卡, 登录账号 继续查看答案
重置密码
确认修改