In the animal kingdom，killer whales （虎鯨） are social stars：they travel in different family groups，care for grandchildren，and even imitate human speech.Now，scientists are adding one more behavior to the list：forming fast friendships.A new study shows killer whales can rival animals such as chimpanzees and macaques （a kind of monkey），and even humans when it comes to the kind of "social touch" that is a sign of strong friendship.
Some ocean animals maintain social structures — including male dolphins （海豚） that learn the "names" of their close friends.But there is little proof about wild killer whales.That's where drone （無人機） technology came in.Michael Weiss，a behavioral ecologist，teamed up with his workmates to launch drones，flying them 30 to 120 meters above a group of killer whales.That was high enough not to trouble the whales，marking the first time drones have been used to study friendly physical contact in whales.
The researchers recorded over 800 examples of physical contact between individuals.Those included slippery hugs，back-to-back and nose-to-nose touches between pairs of whales.Other whales playfully threw young whales into the air，letting them fall into the water.Besides，the drone pictures showed clear preferences among individuals，usually for one "best friend" of the same sex and age.Take J49 and J51 — two distantly related young males aged 9 and 6 — for example. "Every time you see a group of whales，those two are right there communicating with each other，" Weiss says.
The young led most of these interactions，rather than the older females or males.Older males in particular were less important. "The young individuals really seem to be the glue （膠水） holding the groups together，Weiss says.As individuals age，this gradual loss of "centrality" is known in many social mammals，including humans.That finding is "especially appealing" to biological anthropologist Stacey Tecot，who didn't join in the study. "Scientists have long observed this social aging trend in animals，but there are still many unanswered questions，" she says.That certainly on the researchers' radar. "We're already gathering new proofs，with more advanced equipment，" says Weiss.
（1）What does the underlined word "rival" in Paragraph 1 probably mean？ BB
A．Rise to.
B．Be equal to.
C．Benefit from.
D．Depend on.
（2）What is new about Weiss' research？ AA
A．The research method.
B．The size of the research team.
C．The target of the research.
D．The time spent on the research.
（3）What did Weiss find about J49 and J51？ AA
A．They have a long-lasting friendship.
B．Their communication is difficult to understand.
C．Their communicating ways change frequently.
D．They prefer playing with young female whales.
（4）What can we infer from the last paragraph？ CC
A．More researchers will take part in the study.
B．Other scientists take a negative attitude to the research.
C．Researchers will get more proofs to study killer whales.
D．Researchers will uncover the social aging trend in animals soon.
【答案】B；A；A；C
【解答】
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發(fā)布：2024/4/24 14:0:35組卷：9引用：3難度：0.3
相似題
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Protecting habitats（棲息地）is important for keeping biodiversity.In 2003，over 102，000 habitats covering nearly 19 million square kilometres，or 11.5% of the world's land surface，were under some form of protection.Though this is a great improvement since 1962，when just 1，000 protected habitats were listed，it is still not considered enough to stop the ecocide that is endangering the world's biodiversity.
For a number of environmentalist，protecting the world's 25 biodiversity hotspots（熱點地區(qū)）is critical to saving habitats and species.But many hotspots are endangered already，having lost up to three-quarters of their original plants.
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Protecting hotspots is not simply a matter of putting up fences and employing guards.The best results are achieved when local people are educated about the value of wildlife，and actually gain a share of the benefits from eco-tourism.Only then do they have a chance to see the benefits of protecting hotpots.
（1）What can we infer from paragraph 1？
A．The loss of any species can affect humans.
B．Endangered species are paid more attention to by humans.
C．Species can still survive when their ecosystems are destroyed.
D．Ecosystem protection is as important as diversity protection.
（2）What does the underlined word "ecocide" in paragraph 2 mean？
A．Ecosystem protection.
B．Reduction of the number of species.
C．Serious damage to habitats.
D．Habitats protection.
（3）What's the direct cause of the terrible state of the hotspots？
A．Population growth in hotpots.
B．Migration out of these areas.
C．Global warming.
D．The global average population growth rate.
（4）What's the author's opinion on protecting the hotspots？
A．It's simple to carry out.
B．It leads to the increase of tourists.
C．It's closely connected with local people.
D．It suggests that the local people are well educated.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.5 -
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（2）From the second paragraph，we can see that.
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（4）what is the main idea of this passage？
A．Access to nature improves our life.
B．Nature treats children for ADHD.
C．Getting close to nature reduces crime.
D．Man can't live without natural areas.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.5 -
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A．They couldn't delay the program for a year.
B．They can make full use of the library resource.
C．They wouldn't bring any potential danger to their family.
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（2）What do international students staying in the United States think of the new rule？
A．The new rule treats them as American citizens.
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（3）What is the government's attitude towards the new rule？
A．Favorable.
B．Neutral（中立）.
C．Unfavorable.
D．Unclear.
（4）What does the underlined phrase "in limbo" in the last paragraph mean？
A．Horrible.
B．Flexible.
C．Uncertain.
D．Unbelievable.發(fā)布：2025/1/6 15:30:8組卷：0引用：1難度：0.5