Killer whales（虎鯨），also known as orcas，are known for their severe attacks（攻擊） on sea animals but they have never posed a threat to humans.However，since late July，the normally social animals have been intentionally attacking sailboats off the coasts of Spain and Portugal.
The strange behavior first surfaced on July 29，2020，when a 46 foot boat was repeatedly attacked for almost an hour by nine orcas，causing the boat to rotate （旋轉(zhuǎn)） 180 degrees and having its engine switched off.Since then，over 30 more similar incidents have been reported.On September 23，2020，Spain's government banned boats of less than 50 feet in length from sailing in the 60 mile stretch of the Atlantic coastline between Ferrol and the Estaca de Bares Cape，where the attacks have been occurring.
Researchers across the world are trying to explain the orcas' behavior.Some believe it could be a result of the overfishing of the bluefin tuna—the orcas' primary food source—which has left the area's killer whales starving and unable to feed their babies. "I saw them look at boats carrying fish.I think they know humans are somehow related to food shortages，" says Ken Balcomb，senior scientist at the Center for Whale Research in Washington，USA.The environmentalists believe the sudden increase in boat traffic after months of absence due to restrictions on human activity last spring，could also be contributing to the agitation.
However，Alfredo López，a biology professor in Galicia，Spain，thinks the attacks are defensive measures the orcas took to protect themselves against boat injuries.The researcher came to this conclusion after looking at the videos of a few incidents and noticing that two of the young killer whales involved had serious injuries.Hopefully，the experts will be able to find a way to restore the harmony between the animals and the humans soon.
（1）What do we know about orcas in paragraph 1？ BB
A．They are friendly to humans.
B．They have changed their behavior.
C．They are famous for hunting skills.
D．They have met tough living conditions.
（2）Who hold（s） the idea that fishing activities caused the incidents？ AA
A．Ken Balcomb.
B．The environmentalists.
C．Alfredo López.
D．Spain's government.
（3）What do the underlined words "the agitation" in paragraph 3 refer to？ AA
A．The attacks.
B．Food shortages.
C．The overfishing.
D．Human activity.
（4）What is the main idea of this passage？ BB
A．A disagreement between scientists.
B．Possible reasons why killer whales are attacking boats.
C．The results of the change of the behaviors of killer whales.
D．Spanish government's effort of protecting the fishing boats.
【考點(diǎn)】自然科學(xué)研究成果；說(shuō)明文．
【答案】B；A；A；B
【解答】
【點(diǎn)評(píng)】
聲明：本試題解析著作權(quán)屬菁優(yōu)網(wǎng)所有，未經(jīng)書(shū)面同意，不得復(fù)制發(fā)布。
發(fā)布：2024/5/27 14:0:0組卷：3引用：3難度：0.5
相似題
-
1．Like a tired marriage，the relationship between libraries and publishers has long been dull.E-books，however，are causing heartache.Libraries know they need digital services，but many publishers are too cautious about piracy and lost sales to co-operate.Among the big six publishers，only Random House and Harper Collins license e-books with most libraries.
Publishers are wise to be nervous.Owners of e-readers are exactly the customers they need：book-lovers with money.If these people switch to borrowing e-books instead of buying them，what then？Electronic borrowing is awfully convenient.Unlike printed books，which must be checked out and returned to a physical library miles away，book files can be downloaded at home.The files disappear from the device when they are due.
E-lending is not simple，however.There are various incompatible e-book formats，devices and licenses.Most libraries use a company called OverDrive，which secures rights from publishers and provides e-books and audio files in every format.Yet publishers and libraries are worried by OverDrive's global market dominance，as the company can control fees and conditions.Publishers were annoyed when OverDrive cooperated with Amazon，the world's biggest online bookseller，last year.Owners of Amazon's Kindle e-reader who want to borrow e-books from libraries are now redirected to Amazon's website.
According to Pew，an opinion researcher，library users are a perfect market for Amazon.Late last year Amazon introduced its Kindle Owners' Lending Library，which lets its best customers borrow free one of thousands of popular books each month.But a recent Pew survey found that more than half of Americans with library cards say they prefer to buy their e-books.It also noted that e-books actually are available at most libraries，and that popular titles often involve long waiting lists，which may inspire people to buy.
So publishers keep adjusting their lending arrangements in search of the right balance.Random House raised its licensing price earlier this year，and Harper Collins limits libraries to lending its titles 26 times.The story of the library e-book is a nail-biter.
（1）It can be inferred from Paragraph 1 that.
A．several big publishers have sold e-books to libraries
B．both libraries and publishers caution the e-book piracy
C．some publishers are hesitant to cooperate with libraries
D．libraries are eager to keep strong relationship with publishers
（2）What worries publishers about people's switch to e-books？
A．The risk of e-book piracy.
B．The possible decline of book sales.
C．No time limit for the downloaded book files.
D．The availability of the incompatible e-book formats.
（3）We can learn from Paragraph 3 and 4 that.
A．Amazon is adopting measures to win more customers
B．OverDrive distributes e-books and audio files to publishers
C．over half of Americans are borrowing e-books from libraries
D．the fees of lending e-books are under the control of publishers
（4）What is the best title for the text？
A．The Hopeful Future of Publishing Business
B．The Uncertain Economics of Lending E-books
C．The Dull Relationship between Libraries and Publishers
D．The Close Cooperation between OverDrive and Amazon發(fā)布：2025/1/1 16:0:1組卷：1引用：3難度：0.5 -
2．One day something that upset me happened，bringing（1）
（tear）to my eyes and making me angry.The incident took me out（2）balance and disturbed my inner peace.
To restore calm，I put on my outdoor equipment，picked up my skis（滑雪板）and（3）（go）to the park.I skied at（4）slow steady pace.I listened to the sound of the snow beneath my skis and the wind blowing through the bare branches of the trees.
I was honest with myself，（5）（recognize） that I was angry and could let it go.With each pass around the park，I felt my inner peace returning.I began to hear the birds singing.I noticed the wind had filled in my tracks with snow in some areas，creating a clean snowfield.I felt the（6）（strong）of my arms and legs as they worked together，aiming（7）（make） the skiing an enjoyable experience.I felt the healing power of being in nature.
I forgave（8）（I）for reacting with anger when it served no purpose.I forgave those people，（9）gave me cause to lose my temper.My heart（10）（fill） with light and love for all.發(fā)布：2025/1/1 16:0:1組卷：2引用：2難度：0.9 -
3．Is there a link between social media and depression？Do social media have a negative impact on your mental health？It's complicated.
In a recent study，the investigators compared social media use and depression between teens.（1）Specifically，for every hour per day that one teen spent on social media more than her peers，she likely had a 0.64-point higher depression score.
A different study published in 2018 identified five distinct types of social media users.The finding was that "problematic social media use" was one of the main themes for people whose mental health was affected by social media.You can have alcohol in your life without it being a problem，or your alcohol use may become problematic. （2）
There's one important thing to remember about survey research — just because two things happen together，it's not necessarily true that one causes the other.（3）For all we know，it could be that people who are already more depressed choose to spend more time on social media.
（4）If you think that we shouldn't paint social media with one broad brush，you're on the right track.On the one hand，participants often described social media as a valuable way to cope with stress.On the other hand，cyberbullying via social media was also a common experience for participants.Some also said that constantly checking their own social media profile was stressful.
It's certainly possible that experiences like cyberbullying，comparing yourself to idealized images，and constantly monitoring your profile，are bad for your mood.It's also true for many that social media offer community support and positive messages.Given the inconclusive research，it's safe to say that at least we shouldn't write off social media altogether.（5）Anyway，you cannot use it as a crutch（依靠）for coping with other stressors and mental health problems.
A.It's the same with social media.
B.Social media can be a double-edged sword.
C.People get more opinionated about the potential problems of social media.
D.They found that those who used social media more had higher depression scores.
E.They reviewed all existing research and found that there were both benefits and drawbacks.
F.The key to benefiting from social media may lie in using it in moderation and staying socially connected.
G.For example，just because higher social media use co-occurs with higher levels of depression doesn't mean social media use causes depression.發(fā)布：2025/1/1 15:0:2組卷：6引用：3難度：0.5
把好題分享給你的好友吧~~