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No longer in the pink

The world is going to have to start thinking thoroughly to save its coral reefs. Corals are comeback creatures. As the world froze and melted and sea levels rose and fell over 30,000 years, Australia's Great Barrier Reef, which is roughly the size of Italy, died and revived five times. But now, thanks to human activity, corals face the most complex mixture of conditions they have yet had to deal with.

According to the Intergovernmental Panel on Climate Change, a rise in global temperatures of 1.5°C relative to pre-industrial times could cause coral reefs to decline by 70-90%. When waters become unusually warm, corals throw out the algae, leaving reefs a ghostly white. This ''bleaching'' is happening five times as often as it did in the 1970s.

Corals need protection from local sources of harm. Their ecosystems suffer from coastal currents, whether dirty water or waste from farms. Plastic and other rubbish block sunlight and spread aggressive bacteria. Governments need to carry out tighter rules on these industries, such as tougher local building codes, and to put more effort into strengthening rules against overfishing.

Many reefs that have been damaged could benefit from restoration. Coral's biodiversity offers hope, because the same coral will grow differently under different conditions. Corals of the western Pacific near Indonesia, for example, can survive higher temperatures than the same species in the eastern Pacific near Hawaii.

Stronger measures to fight against the larger threats corals face should also attract more research. Shading reefs using a polymer film as a sunscreen to cool them is under discussion for parts of the Great Barrier Reef. Other schemes to help corals involve genetic engineering, selective breeding and brightening the clouds in the sky above an area of the reef by spraying salt into the lowest ones, so that they turn away more of the sun's energy. These measures may sound extreme, but people need to get used to thinking big. Dealing with the problems caused by climate change will call for some far-reaching ideas.

1.Thorough thinking is needed to save the coral reefs because __________.

A.corals have come back in the Great Barrier Reef in Australia

B.corals are frozen and melted five times over 30,000 years

C.corals are strong enough to survive human activity

D.human activity are threatening the condition of coral reefs

2.The underlined word ''bleaching'' most probably means _______.

A.warming B.throwing out

C.whitening D.dying

3.Corals are being damaged by the following local sources EXCEPT ___________.

A.coastal water flows B.more sunlight

C.waste from farms D.bad bacteria

4.Some extreme solutions to saving corals are mentioned in the passage in order to ______.

A.encourage people to come up with more ideas

B.introduce some advanced technological progress

C.raise people's awareness of protecting the environment

D.warn people of the threats and risks corals are facing

高三英语阅读理解中等难度题

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