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题型:阅读理解-阅读单选 难度:0.65 引用次数:101 题号:22687108

Around the world, coral reefs (珊瑚礁) are in danger. Now, let’s check out a few ways conservationists are protecting these habitats.

Seaweed Smackdown

Hot ocean temperatures can supercharge seaweed growth — and that’s not good for a reef. So, in Hawaii, scientists have used an underwater vacuum (真空吸器) to suck up lots of seaweed into the device’s long tube. In Australia, scientists are studying a low-tech solution: pulling seaweed by hand.

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Some polyps (珊瑚虫) are harmed by heat waves and pollution. Scientists cut parts of coral from a healthy reef. Then these polyps are taken to a nursery, which could be in shallow protected areas underwater. After about a year, the healthy coral parts are attached to damaged reefs. The nursery-grown corals can bring new life to a struggling habitat.

Sound Saver

Healthy reefs are noisy. Fish make different sounds, and thousands of shrimp create and pop bubbles with their claws to create a sound. The biologists play sounds of healthy reefs through underwater speakers. They found that six weeks of broadcasting healthy reef sounds doubled the amount of fish in the area.

Bleaching Killer

One of the biggest threats to coral reefs is bleaching. Here’s how it works.

Thriving coral

Most coral species survive by partnering with tiny algae (藻类), which make food for the coral by changing sunlight into sugar.

Under stress

But when the ocean water gets too hot, the algae produce too much oxygen, which can hurt the coral.

Bleaching

So corals kick out the algae. As the algae leave, the color disappears and the coral appears to turn white. This process is called bleaching.

Biologists have discovered that many corals in the Red Sea have a species of algae in their tissue that’s found nowhere else, so they can survive heat waves. Biologists hope their work will inspire governments and environmental groups to protect these corals.

1. Which of the following might be the subtitle of Paragraph 3?
A.Underwater Nurseries.B.Fishing Guides.
C.Seaweed Cleaners.D.Colour Designers.
2. What can mainly help stop corals bleaching?
A.Breathing in more oxygen.B.Changing the appearance.
C.Absorbing more sound.D.Partnering with algae.
3. What is the author’s purpose of writing this passage?
A.To present the serious damages to corals.B.To explain the reasons for coral habitat loss.
C.To introduce the methods of coral protection.D.To compare the effects of different solutions.
【知识点】 环境保护 应用文

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【推荐1】At the age of 50, Nina Schoen expects to have a long life ahead of her, but has thought a lot about death—and why people are so reluctant to talk about it: “It’s going to happen to all of us,” she says, “but it should be a more positive experience than the fear we put into it.”

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1. How do people react when it comes to death according to paragraph 1?
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