Cuvier's beaked whale, hearing starts in the throat, a new study found
O
The observation might help explain how all whales hearThe work might also
O
help scientists understand how animals are affected by underwater sonar (声呐) This
O
sonar, used by some ships, sends out sound waves to locate underwater objects
O
The Cuvier's beaked whale is a so-called toothed whaleToothed whales dive
O
deep into the ocean in search of foodAs the whales hunt, they produce sounds that
O
reach objects and then return to the whalesThis allows the animals to“see”the shape,
O
size, and location of objects, even when they're 1, 000 meters under the sea, where it is totally dark2-1-c-n-j-y
O
To better understand how the whale hears, researchers from San Diego State University in California took X-rays of two Cuvier's beaked whalesThe
O
whales had died and washed up on the beach【出处：21教育名师】
O
The Cranford and his colleagues used the images to make a computer model of a Cuvier's beaked whale's headThen, they modeled the process of sound traveling
O
through the head
O
The researchers knew that some sounds get to the ears of a toothed whale through a structure called“the window for sound” Found on the lower jaw, this
O
structure is very thin on the outside and has a large pad(垫) of fat on the inside
O
When the researchers and their computer model to work out how sound waves travel in the whale's head, they were surprised to find that sounds coming from right in front of the whale actually travel under the animal's jawFrom there, sound waves
O
move through the throat, into a hole in the back of the jaw, and finally to the pad of fat near the animal's ears
O
36 Toothed whales ________ to search for what they will eat under the sea
O
O
A measure the shape and size of their objects
O
B watch deep into the sea
O
C ask other whales to work together
O
D give out signals and wait for them to return
O
37 Researchers took X-rays of two Cuvier's beaked whales in order to ________
O
O
A find out why they had died and washed up on the beach
O
B make a computer model of a Cuvier's beaked whale's head
O
C make sure that sound travels through the head
O
D know more about the way the whale hears
O
38 Which of the following describes the way taken by sound waves through a
O
Cuvier's beaked whale
O
A A hole in the back of the jaw→the ears→the jaw→the throat
O
O
B The jaw→the throat→a hole in the back of the jaw→the ears
O
O
C The throat→the jaw→the ears→a hole in the back of the jaw
O
O
D The ears→the throat→a hole in the back of the jaw→the jaw
O
O
39 According to the passage we know that ________
O
O
A the throat is important to the Cuvier's beaked whale's hearing
O
B ships send out sound waves like a Cuvier's beaked whale
O
C the ears are actually useless to the Cuvier's beaked whale
O
D the researchers haven't found how the whales hear21·cn·jy·com
O
B
(2013·天津高考改编)Last night's meteor (流星) shower left many people in the community dissatisfied and demanding answersAccording to Gabe Rothschild,
O
Emerald Valley's mayor, people gathered in the suburbs of the city, carrying heavy telescopes, expecting to watch the brightly burning meteors passing through the skyWhat they found instead was a sky so brightened by the city's lights that it
O
darkened the light of the meteors passing overhead21cnjycom
O
O“My family was so frustrated, ”admitted town resident Duane Cosby“We
O
wanted to make this an unforgettable family outing, but it turned out to be a huge disappointment”
O
Astronomers—scientists who study stars and planets—have been complaining about this problem for decadesThey say that light pollution prevents them from
O
seeing objects in the sky that they could see quite easily in the pastThey call on
O
people and the government to take measures to fight against it
O
There is yet a population besides professional and amateur star observers that suffers even more from light pollutionThis population consists of birds, bats, frogs,
O
snakes, etcFor example, outdoor lighting severely affects migrating (迁徙的)
O
birdsAccording to the International Dark-Sky Association , “100 million birds a year
O
throughout North America die in crashes with lighted buildings and towers”
O
Countless more animal casualties (伤亡) result from the use of artificial lightingClearly, people enjoy the benefits of lighting their evenings, but some
O
scientists think it can be harmful for humans, tooThey worry that exposure to light
O
while sleeping can increase a person's chances of getting cancer21cnjycom
O
OOEmerald Valley is only one community that is becoming aware of the negative effects of light pollutionFor years, Flagstaff, Arizona, has enforced lighting
O
regulations in its city in order to assist astronomers at the Lowell ObservatorySimilar
O
efforts have been made worldwide, and a movement is underway to remind us to turn off lights when we are not using them, so that other creatures can share the night
O
40 It happened last night that ________
O
O
A the city's lights affected the meteor watching
O
B the meteors flew past before being noticed
O
C the city light show attracted many people
O
D the meteor watching ended up a social outing
O
41 What do the astronomers complain about
O
O
A Meteor showers occur less often than before
O
O
B Their observation equipment is in poor repair
O
O
C Light pollution has remained unsolved for years
O
O
D Their eyesight is failing due to artificial lighting
O
O
42 What is the author concerned about according to Paragraph 4
O
O
A Birds may take other migration paths
O
O
B Animals' living habits may change suddenly
O
O
C Varieties of animals will become sharply reduced21世纪教育网版权所有
O
O
D Animals' survival is threatened by outdoor lighting
O
O
43 What message does the author most want to give us
O
O
A Saving wildlife is saving ourselves
O
O
B Great efforts should be made to save energy
O
O
C Human activities should be environmentally friendly
O
O
D New equipment should be introduced for space study
O
O
C
“The noise made by boats of whale watching tourists may be causing communication problems for the animals, ”British researchers said last week
O
Whale watching is a popular tourist activity in places where groups of killer whales(虎鲸)liveEvery day, dozens of boats filled with tourists go to watch the
O
beautiful animalsUnfortunately, the engines of the boats make a lot of noise, and that
O
may be causing problems for the whales, according to a report in the US science magazine Nature
O
The whales travel in groups, and communicate with each other through sonic (声波的) calls that some scientists refer to as singingThe sounds of the
O
boat engines may be creating too much background noise for the whales to be able to hear each other
O
The researchers listened to recordings of whale calls made between 15 and 25 years ago, before whale watching became popularThese were compared to more
O
recent recordings
O
They found that the animals have started to sing for longer than they used to, like a person shouting to a friend across a noisy room
O
It is believed that the whales are trying to communicate hunting or breeding informationScientists said that, if this is prevented, the future of the world's whale
O
population could be in danger
O
“Animals become slow in mind and repeat themselves in noisy areas, ”said Volker Deecke, a Canadian biologist“They have to say things twice or
O
three times in order to be understood”
O
The killer whales studied were living off the coast of northwestern AmericaThe number of killer whales in this area has been falling for several years,
O
but scientists are not sure why
O
44 The passage mainly tells us ________
O
O
A the problems of whale watching
O
B how killer whales communicate with each other
O
C the reduced population of killer whales caused by whale watching
O
D hearing problems of the killer whales caused by whale watching
O
45 Now in a noisy background, the killer whales have to ________
O
O
A sing in a louder voice
O
B sing longer
O
C travel in smaller groups
O
D get nearer to each other
O
46 Scientists believe that killer whales sing to ________
O
O
A warn each other of dangers
O
B keep in the same group
O
相关推荐：
loading