?Sucking blood is a risky business.At least for the female mosquitoes that need these nutrients to nurture their developing eggs.Not only do these bugs have to find a suitable blood donor，but once they've had their fill，they have to be able to escape undetected-to avoid the big swat.How they finesse this stealthy departure has just been revealed in the Journal of Experimental Biology.
?Feasting（飽餐）on an unsuspecting mammal can double a mosquito's body mass.So how does a fully loaded female heave that added bulk off the skin of her host without triggering its pressure sensors and bringing on that fateful slap？To find out，F(xiàn)lorian Muijres of Wageningen University in The Netherlands and his colleagues used cameras that record 13，500 frames per second to capture the takeoff maneuvers of 63 blood-fed malarial mosquitoes.
?What they discovered is，when it comes to a soft yet speedy getaway...for female skeeters，the wing's the thing.With a wingbeat frequency of about 600 beats per second...the insects are able to lift themselves lightly off their host.That approach is the opposite of the one favored by most other winged things，says Muijres.
?"When most flying animals when they take off，like birds or a fly for example，they first use their legs to push off very hard，and then when they are in the air，then they start beating their wings and generate aerodynamic lift（氣動(dòng)升力）to be able to fly away.Mosquito does it the other way around.It first starts beating its wings and through the aerodynamic forces these wings generate，their body is being lifted off from the substrate.And then they do gently also push down with their long legs to be able to further power their liftoff.But these forces that are being generated by the legs are relatively small."
?In fact，the faint flutter of a mosquito's wings produces less than one third of the force exerted by similar-sized but much less subtle fruit flies as they shove off in search of another banana.And even on a full stomach，these bloodsuckers are stunningly fast，says Muijres. "So takeoff phase takes only about 30 milliseconds，which is 10 times faster than how fast we can blink our eye." And they're gone before we know what hit us.And before we can hit them.
（1）What does the passage mainly talk about？ CC
A．How mosquitoes get nutrients for their developing eggs.
B．How mosquitoes can find their suitable blood donors
C．How mosquitoes escape undetected after sucking blood.
D．How the female mosquitoes find their perfect partners.
（2）What plays the most important part in helping mosquitoes escape？ DD
A．Their legs.
B．Their ears.
C．Their mouths.
D．Their wings.
（3）Mosquitoes' takeoff approach is different from that of most other winged insects in that CC.
A．mosquitoes are lighter than them
B．mosquitoes are keen on sucking blood
C．mosquitoes take off first with wings and then legs
D．mosquitoes take off through the aerodynamic forces
（4）From what Muijres said，we know that mosquitoes' escape speed is AA.
A．extremely fast
B．equal to that of our blink
C．faster than that of fruit flies
D．greatly affected by their full stomach
（5）The underlined words in paragraph 1 means BB.
A．eggs
B．blood
C．mosquitoes
D．bugs
（6）The underlined words in paragraph 2 "added bulk"refer to AA.
A．extra weight from sucking blood
B．a(chǎn)n unsuspecting mammal
C．a(chǎn) fully loaded female
D．her host
【答案】C；D；C；A；B；A
【解答】
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發(fā)布：2024/6/27 10:35:59組卷：5引用：1難度：0.5
相似題
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1．It is widely believed that biodiversity（生物多樣性）is promoted to save species.But in reality species exist only as part of ecosystems and cannot survive unless their ecosystems are protected along with as much as possible of the diversity they contain.
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(diǎn)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.
The poor state of most biodiversity hotspots results directly from population growth and migration（遷移） into these areas.A study found that by the mid-1990s around 1.1 billion people lived in these hotspots.Moreover，the annual population growth rate in these areas was 1.8%，higher than the global average of 1.4%.The PAI report concluded that human-related environmental changes will continue to put pressure on hotspots.Therefore，keeping biodiversity requires paying close attention to population size.
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 -
2．Most of us spend our lives seeking the natural world.We go fishing，sit in the garden，have a picnic，live in the suburbs or go to the seaside.The most popular leisure activity in Britain is going for a walk.When joggers jog，they don't run on the streets.Every one of them tends to go to the park or the river.
But despite this，our children are growing up naturedeprived（剝奪）.I spent my boyhood climbing trees.These days，children are robbed of the ancient freedom，due to problems like crime，traffic，the loss of the open space and strange new ideas about what is best for children，that is to say，things that can be bought，rather than things that can be found.
The truth is to be found elsewhere.A study in the US：families had moved to better housing and the children were assessed for ADHD—Attention Deficit Hyperactivity Disorder（注意力缺陷多動(dòng)癥）.Those whose accommodation had more natural views showed an improvement of 19%；those who had the same improvement in material surroundings but no nice view improved just 4%.
ADHD is one of the great problems of modern childhood.One study after another indicates that contact with nature gives huge benefits to ADHD children.However，we spend money on drugs rather than on green places.
The life of old people is measurably better when they have access to nature.The increasing concern for the growing population of old people is in quality rather than quantity of years.And study after study finds that a garden is the single most important thing in finding that quality.Even problems with crime and aggressive behaviour are reduced when there is contact with the natural world.
We need the wild world.It is essential to our wellbeing，our health and our happiness.
（1）According to the author，people enjoyto seek nature.
A．jogging on the street
B．running in the gym
C．shopping in the supermarket
D．sitting in the garden
（2）From the second paragraph，we can see that.
A．Children don't want to approach nature
B．children probably spend less time in nature nowadays
C．climbing trees will certainly do good to the children
D．children tend to be happier as a result of their material satisfaction
（3）In what way do people benefit from their contact with nature？
A．Children with ADHD can be cured.
B．Children's performance at school is greatly improved.
C．Problems with crime and violent behavior will easily be solved.
D．A garden nearby improves the quality of old people's life.
（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 -
3．New editions of Roald Dahl's classic books，such as Charlie and the Chocolate Factory and Matilda，are now available in bookstores.Some passages relating to weight，mental health，gender and race were changed.The changes made by Puffin Books，a division of Penguin Random House，first were reported by Britain's Daily Telegraph newspaper.
The changes to Dahl's books mark the latest debate over cultural sensitivity.Those who support updates seek to protect young people from cultural，ethnic and gender stereotypes in literature and other media.Critics complain that revisions to suit 21st century sensibilities risk weakening the genius of great artists and preventing readers from facing the world as it is.
The Roald Dahl Story Company controls the rights to the books.The company said it worked with Puffin Books to review the texts because it wanted to ensure that"Dahl's wonderful stories and characters continue to be enjoyed by all children today."
Inclusive Minds，a group that is working to make children's literature more inclusive and accessible，reviewed the language in a partnership effort with Puffin Books.Inclusive language avoids terms that could be seen as excluding specific groups of people.Any changes were"small and carefully considered，"the company said.
"When publishing new print runs of books written years ago，it's not unusual to review the language used alongside updating other details，including a book's cover and page layout，"the company said their guiding principle throughout had been to maintain the storylines，characters，and the spirit of the original text.
PEN America，a community of some 7，500 writers that advocates for freedom of expression，said it was"alarmed"by reports of the changes to Dahl's books.Suzanne Nossel，chief executive of PEN America，commented on Twitter.She said if we try"to correct for sensing slights （怠慢） instead of allowing readers to receive and react to books as written，we risk distorting the work of great authors and clouding the essential lens （透鏡） that literature offers on society."
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（1）What is the reason for the changes to Dahl's books？
A．To make Dahl's books more enjoyable.
B．To review the language used and add details.
C．To remove words that show disrespect to some people.
D．To keep the storylines，characters，and the spirit of the original text.
（2）What might the underlined word in Paragraph 6 probably mean？
A．Preventing.
B．Appreciating.
C．Understanding.
D．Misrepresenting.
（3）Which of the following may Laura Hackett agree？
A．The new version of the books is worth collecting.
B．The original version of the books are more valuable.
C．The original books weaken the genius of great artists.
D．The new version allows readers to receive books as written.
（4）What might be the proper title of the passage？
A．New Changes to Roald Dahl Books Start Argument
B．Different Opinions on New Editions of Classic Books
C．Authors or Publishers both Control the Right to Books
D．New Editions of Roald Dahl's Classic Books Available
（5）What is the purpose of the passage？
A．To persuade readers to buy Roald Dahl's classic books.
B．To entertain readers by the changes of Roald Dahl's books.
C．To recommend the new version of Roald Dahl's classic books.
D．To inform diverse views on the changes of Roald DahI's books.發(fā)布：2025/1/30 8:0:1組卷：2引用：1難度：0.4