Climatic instability, which leads to rising sea temperatures, causes corals to bleach.Bleaching occurs when sea temperatures rise and this causes the coral tissue to expel their symbiotic algae called zooxanthellae - these are what give the coral their colour.Bleached corals often die if the stress continues.Among the 10 species chosen to start the Edge project are the pearl bubble coral, a food source for the hawksbill(玳瑁)turtle, and the Mushroom coral, which supports at least 15 brightly colored fish.
41.What does the first paragraph mean in the passage ?
A.Conservationists planned to preserve and protect some extinct corals years ago.
B.Conservationists have banned plans to protect endangered corals for years.
C.Conservationists are going to protect corals that are dying out in several ten years.
D.Conservationists have made plans to protect corals from being extinct in ten years.
42.What will probably happen to coral species with the increasing threats?
A.Decrease.
B.Losing functions. C.Disappearance. D.Existence.
43.Which of the following statements about the Edge Plan is TRUE?
A.The Edge Coral Reefs project was carried out by American scientists.
B.The plan concentrates on the channels to protect the endangered species.
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