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. |
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. |
A.They are dangerous. | B.They are adorable. |
C.They are helpful. | D.They are smart. |
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. |
相似题推荐
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 life | B.plants cannot grow without air |
C.there are many plants in the world | D.we can not live without water |
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. |
A.Kept. | B.Guarded. |
C.Prevented. | D.Surrounded |
A.a medicine book | B.a novel |
C.a science magazine | D.an experiment report |
【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 |
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 |
A.so you’d better fertilize them |
B.probably because the source of nitrogen is cut off |
C.simply because they can’t absorb nitrogen from the soil |
D.and then they will die slowly |
A.“Meat-eating” plants look and act like other green plants. |
B.No insects, no “meat-eating” plants. |
C.The reason why Venus flytrap needs flies is that it needs to get nutrient from them. |
D.Green plants make sugar at night. |
A.化学物 | B.营养物 | C.肥料 | D.氮氢化合物 |
【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. |
B.Being spotted by humans. |
C.Being caught by the harness. |
D.Being driven away from his familiar surroundings. |
A.His poor condition. | B.His mysterious identity. |
C.His strange tracks. | D.His faraway birthplace. |
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. |
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. |
【推荐1】Spring is just around the corner, but if you are tired of sunflowers, tulips (郁金香) and other standard gardens, why not head to one of these mysterious and wonderful botanical gardens?
Butchart Gardens, British Columbia, Canada
One of the rarest flowers you’ll find at Butchart Gardens is the Meconopsis, otherwise known as the Tibetan blue poppy. The most impressive flowers can be found in the borders, where you’ll find over one million bedding plants. And although the gardens are famous for their perennials (多年生植物), 300,000 spring-flowering plants are grown every year, and over 900 varieties of plants are grown for the summer gardens alone.
Kirstenbosch National Botanical Garden, Cape Town, South Africa
Kirstenbosch National Botanical Garden is one of a handful of botanic gardens to grow only native plants. Some of the most popular varieties include the king protea, which produces enormous flowers between autumn and summer, and the rare silver tree, a silky-leaved plant, which experts believe could become extinct in the next 50 years.
Denver Botanic Gardens, Colorado, US
Once native to South Africa, these oddly-named flowers are famously drought-hardy, making them perfect for this part of North America. This garden is one of the few to focus on draught-tolerant plants from Colorado and the grasslands of Africa, Mongolia and Argentina. In fact, Colorado is home to nine species of endangered plant, and several can be found here.
Arctic-Alpine Botanic Garden, Tromso, Norway
Visit the world’s northernmost botanical garden and you’ll find a breathtaking collection of plants from the world’s polar and mountainous regions including, in the Himalaya section, the rare giant Tibetan blue poppy, with its huge flowers and metre-high stem. You’ll also see the Wilander buttercup, which can only be found in the quite terrible areas of Svalbard’s unforgiving icy islands.
1. Which botanical garden only plants local species?A.Arctic-Alpine Botanic Garden. | B.Denver Botanic Gardens. |
C.Butchart Gardens. | D.Kirstenbosch National Botanical Garden. |
A.Rare and hot-tolerant. | B.Smelly and ill-looking. |
C.Large and tall. | D.Endangered and colorful. |
A.To analyze the features of plants. | B.To make an advertisement. |
C.To protect the endangered plants. | D.To introduce some fantastic gardens. |
【推荐2】The following charities advocate protecting our precious environment. It’s a starting place, but don’t stop here.
Rocky Mountain Institute
Rocky Mountain Institute has made notable achievements in its comparatively short history. In2017, it worked with India’s leadership and government to plan for 100% vehicle electrification(电气化) by 2030. They also provided research that resulted in new U. S. fuel-efficiency standards for trucks, which were expected to cut over one billion tons of CO₂ emissions. Its five-year plan to quicken low-carbon energy transition (转变) was published in early 2018.
Greenpeace Fund
Although Greenpeace solves many environmental problems such as deforestation (滥伐森林) and sustainable food, it has worked to address issues with oceans for decades: plastic pollution, offshore drilling, saving the Arctic, and more. Greenpeace has grown from a small group of activists protesting nuclear testing in 1971 to an international organization with offices in over fifty countries.
Center for Biological Diversity
Founded in 1989, the Center for Biological Diversity uses biological data and legal knowledge to obtain new protections for plants, animals, and their habitats. Its story began with some young students, an ancient tree in Mexico, and a spotted owl’s nest. Its first campaign saved both the tree and the owl. And they continue to grow by expanding territory, staff, and outreach (外展服务).
Sierra Club Foundation
The Sierra Club has been working to protect the environment and its people since 1892. It helped pass the Clean Air and Endangered Species Acts, enabled the creation of many national parks, and worked to move hundreds of coal plants towards clean energy. It also offers environmentally friendly wilderness outings to encourage people to get outdoors. People can take an international trip to study wildlife in Cuba.
1. Which organization has focused on the oceans for many years?A.Rocky Mountain Institute | B.Greenpeace Fund |
C.Center for Biological Diversity | D.Sierra Club Foundation |
A.It aims to expand territory for Mexico. | B.It is targeted at collecting biological data. |
C.Its foundation was inspired by some students. | D.Its symbol contains an ancient tree and an owl. |
A.They both push for the use of green energy. |
B.They both apply the new standard for vehicles. |
C.They both have founded numerous national parks. |
D.They both encourage humans to go outing in the wild. |
【推荐3】All of us eat every day, but most of us don’t understand nutrition. We often make mistakes in talking about good diet.
For example, many people think that foods such as rice, bread and potatoes will make one grow fat. In fact, these foods are very good to one’s health. They are good sources of many vitamins. And in comparison with steak and beef, they contain less amount of calories.
Some people don’t like canned(罐装的) or frozen vegetables, because they think fresh vegetables cooked at home are always better. This is again wrong. In fact, whether the vegetables are good or not depends more on how they are prepared. Overcooking, for example, destroys good qualities of vegetables. Vegetables cooked in too much water can lose a large amount of vitamins.
It is widely believed extra vitamins provide more energy. But taking more than the body needs doesn’t make it function better.
It is also wrong to say that vegetables grown in poor, worn-out soil are lower in vitamins than vegetables grown in rich soil. The vitamins in our foods are in the plants themselves. They don’t come from the soil. However, the minerals(矿物质) in a plant depend on the minerals in the soil.
In short, there are many false ideas about nutrition. We need to correct them.
1. This passage is mainly about_______.A.nutrition | B.vitamins | C.vegetables | D.health |
A.they make people fat |
B.there are lot of vitamins in them |
C.they contain less amount of calories compared with steak and beef. |
D.both B and C. |
A.they think fresh vegetables contain less vitamins |
B.they think fresh vegetables contain more vitamins than the canned or frozen ones |
C.they don’t think the canned or frozen vegetables are fresh |
D.they don’t think the canned or frozen vegetables taste as good as the fresh ones |
A.Many people know almost everything about nutrition. |
B.Food such as rice, bread and potatoes make people fat. |
C.vegetables grown in poor worn-out soil may have the same amount of vitamins as vegetables grown in rich soil. |
D.extra vitamins provide less energy. |
A.the minerals in a plant depend on the minerals in the soil |
B.people make mistakes when talking about good diet |
C.taking more vitamins than the body needs doesn’t make it function better |
D.vegetables cooked in too much water can lose a large amount of vitamins |