California Condor's Shocking RecoveryCalifornia condors（鷹） are North America's largest birds，with wind-length of up to 3 meters．In the 1980s，electrical lines and lead poisoning（鉛中毒） nearly drove them to dying out．Now，electric shock training and medical treatment are helping to rescue these big birds．
In the late 1980s，the last few condors were taken from the wild to be bred（繁殖）．Since 1992，there have been multiple reintroductions to the wild，and there are now more than 150 flying over California and nearby Arizona，Utah and Baja in Mexico．
Electrical lines have been killing them off．"As they go in to rest for the night，they just don't see the power lines，"says Bruce Rideout of San Diego Zoo．Their wings can bridge the gap between lines，resulting in electrocution（電死） if they touch two lines at once．
So scientists have come up with a shocking idea．Tall poles，placed in large training areas，teach the birds to stay clear of electrical lines by giving them a painful but undeadly electric shock．Before the training was introduced，66% of set-freed condors died of electrocution．This has now dropped to 18%．
Lead poisonous has proved more difficult to deal with．When condors eat dead bodies of other animals containing lead，they absorb large quantities of lead．This affects their nervous systems and ability to produce baby birds，and can lead to kidney（腎） failures and death．So condors with high levels of lead are sent to Los Angeles Zoo，where they are treated with calcium EDTA，a chemical that removes lead from the blood over several days．This work is starting to pay off．The annual death rate for adult condors has dropped from 38% in 2000 to 5.4% in 2011．
Rideout's team thinks that the California condors' average survival time in the wild is now just under eight years．"Although these measures are not effective forever，they are vital for now，"he says．"They are truly good birds that are worth every effort we put into recovering them．"
（1）California condors attract researchers' interest because they DD．
A．a(chǎn)re active at night
B．had to be bred in the wild
C．a(chǎn)re found on in California
D．a(chǎn)lmost died out in the 1980s
（2）Researchers have found electrical lines are BB．
A．blocking condors' journey home
B．big killers of California condors
C．rest places for condors at night
D．used to keep condors away
（3）According to Paragraph 5，lead poisoning DD．
A．makes condors too nervous to fly
B．has little effect on condors' kidneys
C．can hardly be gotten rid of from condors' blood
D．makes it difficult for condors to produce baby birds
（4）The passage shows that CC．
A．the average survival time of condors is satisfactory
B．Rideout's research interest lies in electric engineering
C．the efforts to protect condors have brought good results
D．researchers have found the final answers to the problem．
【答案】D；B；D；C
【解答】
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發(fā)布：2024/5/27 14:0:0組卷：30引用：1難度：0.9
相似題
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1．For some people，the warmest memories from childhood come from being read a great story．（1）
It develops children's language skills and increases their ability to succeed in school and，later，work．
A new report by the American Academy of Pediatrics says reading aloud is so important that parents should start as soon as their children are born and continue to read aloud even after their children can read by themselves．They say parents should also point to and talk about pictures in books for infants（嬰幼兒）．（2）
The company Scholastic is fl major U．S．publisher of children's books．Every two years，Scholastic publishes a report on American reading attitudes and habits．The 2015 report says only 31 percent of children in the U．S．read a book for fun almost every day．
（3）One is simply to have books in the home．Elizabeth Lyttleton，the mother of three，is lucky．Her mother once wrote and illustrated children's books，so the family always have plenty to read．She says all her children learn from books-but in different ways．（4）Researchers from the Scholastic company found that 80%of children surveyed-of all ages-say they love being read to．And children ages 6 to 11 whose parents do not read to them anymore say they miss it．
（5）Of all the six to 17-year-olds in the Scholastic study，more than 90%said their favorite books are the ones they chose for themselves．
A．The Scholastic report also suggests permitting children to choose their own books．
B．Scholastic also identifies some ways to develop a love of reading in a child．
C．A book does not have to be serious to be good for kids．
D．For young children，parents should ask questions about the book．
E．Do children still read for fun？
F．Another way to develop a reading habit in children is to read to them．
G．But reading to children does more than create warm memories．發(fā)布：2025/1/1 13:30:1組卷：13引用：7難度：0.7 -
2．Chinese students always complain that they're under great pressure and don't get enough sleep.But they may be surprised to learn that they're much luckier than their peers（同齡人）in South Korea and Japan，according to a recently published report，conducted by Shanghai Academy of Social Sciences on the physical and mental health of senior high school students in the three Asian countries.
According to the study among nearly 6，000 high school students in the three countries，Chinese students are the tallest but poorest in physical fitness.Chinese students are on average 168.17cm，compared with 167.61cm for South Korean students and 164.70cm for Japanese students.Chinese students asked for sick leave more than students in other countries.About 72 percent of Korean students never asked for sick and injury leave during high school，compared to 53 percent for Japanese students and 45 percent for Chinese students.Moreover，Chinese students drink alcohol and smoke earlier than Korean and Japanese students.Around 70 percent of Chinese students have drunk alcohol，compared to 50 percent for Korean and Japanese students.
According to the survey，Japanese and South Korean students suffer more pressure than their Chinese peers.Statistics show 16 percent of students in China said they experienced mental pressure often over the past year，while the numbers in Japan and South Korea were 33 percent and 47 percent respectively.Their worries come from "study"，"future after graduation"， "friendships" and "relationship with their parents".To go with stress，57.9 percent of Korean students sleep the least，less than six hours a day，compared with 46.6 percent of Japanese students and 30 percent of Chinese students.
More Chinese students were satisfied with their physical appearance，double that of students in the survey from Japan and South Korea.The report said that over half of students in South Korea had tried to lose weight in the past year，while in China the figure was only 22 percent.In measures of self-worth，such as "I think I am valuable" and "I think I am successful"，"I can complete many things"， "I won't give up to failure，" Chinese students showed greater self-confidence than students in Japan and South Korea.
（1）What's the main idea of the second paragraph？
A．Chinese students ask for sick leave most often.
B．Chinese students drink most alcohol and smoke earliest.
C．Japanese students ask for least sick leave.
D．Chinese teenagers are tallest，but most unhealthy.
（2）It can be inferred from the passage that.
A．Chinese students are confident in themselves and luckier
B．Chinese students are luckiest，yet most unsuccessful
C．Japanese students are most stressed
D．South Korean students sleep the least
（3）What does the underlined word "that" refer to？
A．the height
B．the number
C．the weight
D．the appearance
（4）The worries that causes students to be stressed come from the following factors EXCEPT.
A．study and career
B．friendships
C．physical appearance
D．family relationship發(fā)布：2025/1/1 16:0:1組卷：0引用：3難度：0.5 -
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（1）Why did the author mention Dolly the sheep？
A．To ensure the safety of cloning.
B．To show that it is easy to clone sheep.
C．To prove the technology has a long history.
D．To tell readers the method used to clone their pets.
（2）What can we know about cloning a pet？
A．Your pet can be brought back to life.
B．The charge of pet cloning is ﹩1-2000.
C．Your new pet will have a parent when cloned.
D．The company will refund you if you give up halfway.
（3）What do the companies' words in the last paragraph mean？
A．Cloning is a moral issue.
B．The future of cloning is unclear.
C．The technology of cloning is not perfect.
D．Yon won't get the exact copy of the former one.
（4）Where is the text most likely from？
A．A travel guide.
B．A newspaper.
C．A science fiction.
D．A textbook.發(fā)布：2025/1/1 16:0:1組卷：19引用：4難度：0.5