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1、Unit 4A glimpse of the future.阅读理解 AScientists have recently discovered the worlds largest known field of seagrass.They did it using videos shot by some extraordinary helpers.The work should help protect the seagrass,and also shows off a powerful way to explore the ocean.As a shelter for many sea cr
2、eatures,seagrass is a flowering plant that normally grows in shallow waters near coasts.They grow in thick fields,known as seagrass meadows(海草草场),which help clean the ocean water.More importantly,they are called“ocean lung”.They help in the fight against the climate crisis.Thats because they store h
3、uge amounts of carbonthe major source of global warming.Damaging these seagrass meadows can release this pollutant again,making things worse.Considering the urgent need to protect seagrass meadows,scientists are eager to know about their size and number.However,the meadows can be hard to spot from a
4、bove,either because the water is too deep or not clear enough.And the ocean is so huge that its hard to study them by diving.So scientists decided to have tiger sharks help the research.Tiger sharks are inborn fast swimmers,and spend a lot of time in seagrass meadows.Between 2016 and 2020,the resear
5、chers attached cameras and other trackers to the fins of seven tiger sharks,and then let them go again.The cameras were designed to fall off after hours and float to the surface.Tracking signals helped find the floating cameras and collect the videos the sharks had taken while traveling for miles.Mo
6、reover,other tools were used,including satellite images,as well as images taken by divers and boats.Putting all this information together,the scientists learned that the waters around the Bahamas are home to the largest seagrass meadow ever discovered.And the meadows cover at least 25,500 square mil
7、es,and could be as large as 35,500 square miles.Different from previous studies,the program discovers how useful large underwater animals can be in helping to learn more about life under the sea.Oliver Shipley,a scientist from the team,says animals like tiger sharks are going to take us to new place
8、s that we didnt know existed.【语篇解读】本文是一篇说明文。文章主要介绍了科学家们发现了世界上已知的最大的海草场。他们借助一些不寻常的助手拍摄的视频来做到这一点。这项工作应该有助于保护海草,同时也展示了一种探索海洋的强大方式。1.Why do seagrass meadows urgently need protection?A.Damaging them will worsen climate crisis.B.They determine the cleanliness of ocean water.C.Sea creatures cant survive wi
9、thout their shelter.D.Their existence balances the underwater ecosystem.答案 A解析细节理解题。根据第二段中的“They help in the fight against the climate crisis.Thats because they store huge amounts of carbonthe major source of global warming.Damaging these seagrass meadows can release this pollutant again,making thin
10、gs worse.”可知,海草草场迫切需要保护是因为破坏它们将加剧气候危机。2.How did tiger sharks help the scientific research?A.By tracking signals scientists sent.B.By bringing back cameras with videos.C.By carrying the recording equipment around.D.By spending a lot of time in seagrass meadows.答案 C解析细节理解题。根据第四段中的“Between 2016 and 202
11、0,the researchers attached cameras and other trackers to the fins of seven tiger sharks,and then let them go again.The cameras were designed to fall off after hours and float to the surface.Tracking signals helped find the floating cameras and collect the videos the sharks had taken while traveling
12、for miles.Moreover,other tools were used,including satellite images,as well as images taken by divers and boats.”可知,虎鲨是通过随身携带记录设备帮助科学研究的。故选C项。3.What is the highlight about the research according to the text?A.Leading scientists.B.Advanced theories.C.Multiple experimental tools.D.Unusual research ass
13、istants.答案 D解析推理判断题。根据最后一段内容可推知,文章中研究的亮点是不同寻常的研究辅助对象虎鲨。4.Which is the most suitable title for the text?A.Man and Nature Work TogetherB.A Novel Way to Explore the SeaC.Sea Grass:An Undervalued PlantD.Ocean Lung Measured by Natural Explorers 答案 D解析标题归纳题。根据文章大意,尤其是第一段和第二段中的“As a shelter for many sea cr
14、eatures,seagrass is a flowering plant that normally grows in shallow waters near coasts.They grow in thick fields,known as seagrass meadows”可知,文章主要讲述了科学家们发现了世界上已知的最大的海草场。他们借助一些不寻常的助手拍摄的视频来做到这一点。这项工作应该有助于保护海草,同时也展示了一种探索海洋的强大方式。故文章最好的标题是“由自然探险家测量的海洋肺”。BThe students stand on a pier(码头)over the Harlem R
15、iver in New York City.They stare down into the brown water.Their teacher,Mr.Rodman,pulls a long rope out of the river.Fastened to the end of the rope is a metal cage and inside are oysters(牡蛎).Taking turns,the students measure all the oysters,and then compare notes.The biggest oyster is over 2 inche
16、s long,much bigger than a healthy size for its age!They also measure the level of oxygen.As more oysters grow,the water should become clearer and hold more oxygen.Also,other animals should move in.Oysters are soft-bodied animals,and share the underwater community with plants,fish,and other life.They are food for crabs and other animals.As new oysters grow,they attach their shells to older ones,forming big reefs with many small spaces where other animals live.Oysters eat algae(藻类).If algae grow t
