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题型:阅读理解-阅读单选 难度:0.85 引用次数:107 题号:17586622

Scientists have discovered the world’s largest known field of sea grass. They did it using videos shot by some unusual helpers: tiger sharks. The work should help protect the sea grass, and also shows off a powerful way to explore the ocean.

Sea grasses are flowering plants that normally grow in shallow waters near coasts. They grow in thick fields,known as meadows(草地). Sea grass meadows help clean the ocean’s water, and provide food and shelter for many sea creatures. Sea grasses store huge amounts of carbon—the harmful pollution that’s making global warming worse. Damaging these sea grass meadows can release this pollution again,so it’s important to protect them.

From above, the meadows can be hard to spot, either because the water is too deep or not clear enough. And the ocean is so huge that it’s simply not possible to study it all by diving. So a team of scientists decided to have sharks help with the research. Tiger sharks are huge, strong, and deadly. But they also live underwater, are fast swimmers, and spend a lot of time in sea grass meadows. Between 2016 and 2020, a team of researchers attached cameras and other trackers to the fins (鳍) of seven tiger sharks. After catching the sharks, the scientists worked quickly to attach the equipment, and then let them go again.

The scientists have learned that the waters around the Bahamas are home to the largest sea grass meadow ever discovered and that the world has roughly 40% more sea grass meadows than they previously thought.

The programme shows how useful large underwater animals can be in helping to learn more about life under the sea. Oliver Ship ley is a scientist at Beneath the Waves,which led the work. He says animals like tiger sharks “...are going to take us to new places that we didn’t know existed.”

1. What can be known about sea grasses in Paragraph 2?
A.They help fight global warming.B.They need to be removed regularly.
C.They mainly live on sea creatures.D.They grow in deep waters of the ocean.
2. Why are Tiger sharks chosen by scientists?
A.They are sensitive to sea grasses.B.Cameras are easily fixed on them.
C.They are the most faithful sea animals.D.They spend much time in sea grass meadows.
3. What does Oliver Ship ley think of sea animals?
A.They are dangerous.B.They are adorable.
C.They are helpful.D.They are smart.
4. What is the main idea of the text?
A.Many new places in the ocean need exploring.
B.Sharks help discover world’s largest sea grass meadow.
C.Scientists have found a powerful way to protect the ocean.
D.Large underwater animals contribute a lot to the ocean.
【知识点】 动物 说明文

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【推荐1】Plants are very important living things. Life could not go on if there were no plants. This is because plants can make food from air, water and sunlight. Animals and man cannot make food from air, water and sunlight. Animals get their food by eating plants and other animals. Therefore animals and man need plants in order to live. This is why we find that there are so many plants around us.
If you look carefully at the plants around you, you will find that there are two kinds of plants: flowering plants and non-flowering plants. Flowering plants can make seeds. The seeds are protected by the fruits. Some fruits have one seed, some have two, three or four, and some have many seeds. But a few fruits have no seeds at all. An example of a fruit without seeds is the banana fruit. Most non-flowering plants do not grow from seeds. They grow from spores(胚芽). Spores are very small. Some spores are so small and light that they can float in the air. We may say that spores are quite the same as seeds. When these spores are all on wet and shady places, they usually grow into new plants.
1. The main idea of the first paragraph is that ________.
A.plants are important for lifeB.plants cannot grow without air
C.there are many plants in the worldD.we can not live without water
2. What can we infer(推断) from the passage?
A.Of all living things animals are most.
B.Spores are seeds.
C.All fruits of flowering plants have seeds.
D.Without plants, man will die out.
3. What is the meaning of the underlined word?
A.Kept.B.Guarded.
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4. This passage may be taken from ________.
A.a medicine bookB.a novel
C.a science magazineD.an experiment report
2017-06-21更新 | 112次组卷
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【推荐2】Let These Plants Swat the Bugs for You

Some plants get so hungry they eat flies, spiders, and even small frogs. What’s more amazing is that these plants occur naturally (in special environments) in every state. In fact, they’re found on every continent except Antarctica.

You’ve probably seen a Venus’ flytrap. It’s often sold in museum gift stores, department stores, and even supermarkets. A small plant, it grows 6 to 8 inches tall in a container. At the end of its stalks(茎)are specially modified leaves that act like traps. Inside each trap is a lining of tiny trigger(触发)hairs. When an insect lands on them, the trap suddenly shut. Over the course of a week or so, the plant feeds on its catch.

The Venus’ flytrap is just one of more than 500 species of meat-eating plants, says Barry Meyers-Rice, the editor of the International Carnivorous Plant Society’s Newsletter. Note: Despite any science-fiction stories(科幻小说)you might have read, no meat-eating plant does any danger to humans.

Dr. Meyers-Rice says a plant is meat-eating, only if it does all four of the following: “attract, kill, digest, and absorb” some form of insects, including flies, butterflies, and moths. Meat-eating plants look and act like other green plants—well, most of the time.

All green plants make sugar through a process called photosynthesis(光合作用). Plants use the sugar to make food. What makes “meat-eating” plants different is their bug-catching leaves. They need insects for one reason: nitrogen(氮). Nitrogen is a nutrient that they can’t obtain any other way. Why?

Almost all green plants on our planet get nitrogen from the soil. “Meat-eating” plants can’t. They live in places where nutrients are hard or almost impossible to get from the soil because of its acidity(酸度). So they’ve come to rely on getting nitrogen from insects and small animals. In fact, nutrient-rich soil is poisonous to “meat-eating” plants. Never fertilize(施肥)them! But don’t worry, either, if they never seem to catch any insects. They can survive, but they’ll grow very slowly.

1. Venus flytrap ________.
A.is a small plant which grows in a container.
B.is a kind of plant which gets hungry easily.
C.can attract, kill, digest and absorb some form of insects.
D.grows 6-8 inches tall
2. From the passage, we know ________.
A.“meat-eating” plants are found on every continent
B.all green plants get nitrogen from the soil
C.bug-catching leaves make “meat-eating” different from other plants
D.some “meat-eating” plants in the rainforest do danger to humans
3. “Meat-eating” plants grow very slowly, ________.
A.so you’d better fertilize them
B.probably because the source of nitrogen is cut off
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A.“Meat-eating” plants look and act like other green plants.
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5. What s the underlined word nutrient in paragraph 5 probably mean?
A.化学物B.营养物C.肥料D.氮氢化合物
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【推荐3】A fisherman I know named Joar Hesten called me late in April last year. A beluga whale was swimming around his boat near the northern tip of Norway. It appeared to be wrapped in a tight harness (套子), and Hesten didn’t know what to do. Belugas are usually found in groups in areas with ice and glaciers (冰川) —rarely alone along the Norwegian coast. As a marine biologist, I knew that the harness needed to be removed as soon as possible. I had no idea how puzzling it would turn out to be.

We contacted the local government. When inspector JørgenRee Wiig and his crew met with the fishing boat, they doubted Joar Hesten had clearly been trained. The mystery deepened when he got into the water to remove the belt. Attached to the harness were a camera mount (支撑架) and clips with the words (in English) “Equipment St. Petersburg.” The stuff didn’t look like anything that a scientist would use to track whales. The rescuers and I wondered whether he’d been trained for a special purpose. We named him Hvaldimir—the Norwegian word for “whale”.

A week after his discovery, Hvaldimir followed a sailboat to Hammerfest harbor, about 25 miles from where he was first spotted. He was thin: He wasn’t eating on his own and seemed unlikely to survive in the wild. Later the authorities decided to feed him; his meals became daily tourist attractions in Hammerfest. Hvaldimir became so popular in Hammerfest that rules had to be posted for interacting with him.

Yet when I slipped into the water to examine Hvaldimir, I was most struck by his friendliness—and his loneliness. During our swim together, Hvaldimir pulled off one of my flippers (脚蹼), which sank into the deep. I shouted to him underwater, and he dived for it. A few minutes later, he returned with my flipper balanced on his nose and presented it to me.

In June Hvaldimir left Hammerfest, in much better shape than when he arrived. Since then he has traveled along the coast of northern Norway, apparently feeding himself.

1. What endangered the whale most according to the author?
A.Getting separated from its group.
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C.Being caught by the harness.
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2. What puzzled the author and other rescuers about Hvaldimir?
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C.His strange tracks.D.His faraway birthplace.
3. What can we learn about Hvaldimir in Hammerfest?
A.He was taken good care of in a zoo.
B.He was transported there by a fishing ship.
C.He was well trained to entertain humans.
D.He might feel comfortable with the presence of humans.
4. Why did the author shout at Hvaldimir?
A.To test its hearing.
B.To express his anger to it.
C.To ask it to pick up his flipper.
D.To prove his training was a success.
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