Covered in lush fur，the thickest in the animal kingdom，sea otters（海獺）can live their entire lives in the ocean，feeding heavily upon seafloor animals such as shellfish.They are often seen to eat clams（蛤），which bury themselves in meadows of eelgrass（大葉藻場），a wide-ranging plant species growing in water.Eelgrass meadows where sea otters dig for clams become partly bare，which is commonly a concern for ecologists.
As it turns out，the meadows with otters are healthier，with more eelgrass，according to a new study published in Science.That's because by gently disturbing the seabed，the otters make the plants flower and produce seeds.What's more，their digging provides more space and sunlight for seeds to settle and grow.The enhanced genetic diversity caused by sea otters could make eelgrass more adaptable to present and future threats.
The finding is a powerful example of how animals such as otters influence their ecosystems beyond predation（捕食），often in unseen and little-known ways，says study leader Erin Foster，a research associate at the Hakai Instjye.aiute.It also means sea otters，an endangered species，are vital to their environments and give eelgrass，which is in danger worldwide，a better chance at staying healthy and surviving.
Seagrass habitats are also important for many fish，providing food for animals，absorbing，and filtering harmful pollution and bacteria from the water. "Genetic diversity typically strengthens the adaptability of species，and considering the challenges we're facing…this will be important for eelgrass meadows，and from this aspect，the impact the otters are having deserves our lasting concern，" says Foster.
（1）What do we know about sea otters？ CC
A．They live part of their lives underwater.
B．They mainly feed on sea animals like fish.
C．They eat clams beneath eelgrass meadows.
D．They become a new concern for ecologists.
（2）How does the author develop paragraph 2？ BB
A．By giving opinions.
B．By presenting reasons.
C．By clarifying concepts.
D．By comparing results.
（3）Why does the author mention the endangered condition of eelgrass？ CC
A．To provide examples of sea otters' predation.
B．To show the urgency to protect the environment.
C．To highlight the role of otters in their ecosystems.
D．To warn against the potential risk of climate change.
（4）What does Foster think of the impact otters have on underwater meadows？ BB
A．Overestimated.
B．Noteworthy.
C．Temporary.
D．Unpredictable.
【答案】C；B；C；B
【解答】
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發(fā)布：2024/5/27 14:0:0組卷：7引用：3難度：0.5
相似題
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1．Rainforests provide much of the world's oxygen.People have been trying to protect them for years.But another type of forest，the cloud forest，is just as important to humans.
These forests are at the tops of mountains，generally near the equator （赤道）.These wet，wooded mountaintops are mainly in African and Central and South American countries.They are called "cloud forests" because their height allows for the formation of clouds among the trees.The trees in these forests pull water out of the clouds.The water gathers on the leaves and falls into small rivers below，which flow into towns at the bottom of the mountain.The yearly rainfall in these areas is about 180 centimetres.Cloud forests can pull in up to 60 percent of that.The water is important to the plants and the people in the area.It helps them survive.
Cloud forests are also home to countless species of plants that can't be found anywhere else.One small cloud forest has as many types of plants as there are in all of Europe.In fact，there are so many that scientists haven't made a complete list of them yet.
These forests are being destroyed at increasing speed.Trees are being cut down，and roads are being built in their place.Some people have a goal to get government money to protect the forests.But they have had little success so far.Another way is to take the place of the destroyed plants with new ones.That，too，has been difficult because the plants are so special.There's plenty of work to be done，but saving the cloud forests is still possible with creative solutions.
（1）Where can you probably find cloud forests？
A．In North America.
B．Far from the equator.
C．In an African country.
D．At the foot of mountains.
（2）How much rainfall is pulled in by the cloud forests in those areas every year？
A．About 60 cm.
B．About 108 cm.
C．About 180 cm.
D．About 300 cm.
（3）What is the main idea of paragraph 3？
A．Europe is short of plant types.
B．Scientists are working on a list.
C．Cloud forests are getting smaller.
D．Cloud forests house many plants.
（4）What will be discussed in the following part of the text？
A．Ways to protect cloud forests.
B．Goals of cloud forest protectors.
C．Difficulties in planting new trees.
D．Successes of getting wide support.
（5）Where can we probably find the text？
A．In a storybook.
B．In a travel guide.
C．In a chemistry textbook.
D．In a geography magazine.發(fā)布：2025/1/1 18:0:1組卷：7引用：3難度：0.5 -
2．Photo Research "If you want to be a better photographer，stand in front of better stuff." Photographer Jim Richardson shared it with otjye.airs.He spends a great deal of time doing photo research，looking for great locations to shoot.
Seeing a wonderful place is bread-and-butter photography-it's just part of the job.Getting there is only half of any great photograph's story.The other half is how the photographer prepares to capture the subject once in front of jye.ai.It is believed that groundwork is part of photography，as essential as knowing exposure and lighting or recognizing the decisive moment to take the shot.Research sounds like a boring task for many photographers，while for others digging into a subject in advance is part of the pleasure.
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"Above all，I'll look for places and events that are seasonal and timeless.I open my mind to what might make a great subject for a picture，" Jim said. "Most travelers tend to think only of places they're visiting，without looking deeper into culture，history or meaning.I try to get in time with the rhythm of the place and in tune with its melody.But most of all I just want to be ready.If I'm ready，I can just about count on being lucky."
（1）What does the underlined word "capture" in Paragraph 2 probably mean？
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（2）What point does the author make about photographers in Paragraph 3？
A．They are unable to decide on the best plan of action.
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D．Some of them refuse to try to understand the way others work.
（3）What is the main idea of Paragraph 4？
A．Sound preparation is a must for a satisfactory photo.
B．One should create photo sites in a photographic trip.
C．Taking photos requires vivid imagination in advance.
D．It is essential to do photo research in central locations.
（4）In the last paragraph，Jim states that.
A．he feels good to visit those historical places
B．he refuses to spend too much time in one place
C．he is careful about choosing the right place to visit
D．he likes to go to places that few people bother to visit發(fā)布：2025/1/1 18:0:1組卷：20引用：3難度：0.7 -
3．The baby is just one day old and has not yet left hospital．She is quiet but alert（警覺）．Twenty centimeters from her face researchers have placed a white card with two black spots on it．She stares at it carefully．A researcher removes the card and replaces it by another，this time with the spots differently spaced．As the cards change from one to the other，her gaze（凝視） starts to lose its focus - until a third，with three black spots，is presented．Her gaze returns；she looks at it for twice as long as she did at the previous card．Can she tell that the number two is different from three，just 24 hours after coming into the world？
Or do newborns simply prefer more to fewer？The same experiment，but with three spots shown before two，shows the same return of interest when the number of spots changes．Perhaps it is just the newness？When slightly older babies were shown cards with pictures of objects（a comb，a key，an orange and so on），changing the number of objects had an effect separate from changing the objects themselves．Could it be the pattern that two things make，as opposed to three？No again．Babies paid more attention to squares moving randomly on a screen when their number changed from two to three，or three to two．The effect even crosses between senses．Babies who were repeatedly shown two spots became more excited when they then heard three drumbeats than when they heard just two；likewise（同樣地） when the researchers started with drumbeats and moved to spots．
（1）The experiment described in Paragraph 1 is related to the baby's．
A．sense of hearing
B．sense of sight
C．sense of touch
D．sense of smell
（2）Babies are sensitive to the change in．
A．the size of cards
B．the colour of pictures
C．the shape of patterns
D．the number of objects
（3）Why did the researchers test the babies with drumbeats？
A．To reduce the difficulty of the experiment．
B．To see how babies recognize sounds．
C．To carry their experiment further．
D．To keep the babies' interest．
（4）Where does this text probably come from？
A．Science fiction．
B．Children's literature．
C．An advertisement．
D．A science report．發(fā)布：2025/1/1 17:0:1組卷：3引用：3難度：0.5
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