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seen from space.It's the size of Germany-a biodiversity hot spot that was once thought to betoo big to fail.But over the last few decades,marine()biologists like Hoegh-Guldberghave watched its rapid decline.Oceans are warming along with the atmosphere,since they absorb much of the excess heatfrom climate change.Repeated marine heat waves over the last five years have turned much ofthe Great Barrier Reef a terribly white color.When temperatures rise,corals()remove themicroscopic algae()inside them,losing their food source in the process.Sometimes thecorals can recover,but increasingly,they're dying off."Something around 50%of the shallow water corals were killed literally over a couple ofmonths,in some cases over a couple of weeks,"Hoegh-Guldberg says."If you extend that outinto the future,we'll get to a point where the damage overwhelms the ability of corals to bounceback.Marine heat waves have already doubled in number since 1980 and are expected to becomemore intense as temperatures rise.At 1.5 degrees Celsius,it's likely that 70%to90%of coralreefs will die off worldwide.At 2 degrees Celsius of warming,99%are lost."If we delay evena year or two more,we really are going down a pathway where there will be no retum.We ncedto act and we need to act decisively,without question and solve this problem."Hoegh-Guldbergadds.28.What do we know about the Great Barrier Reef?.It is supposed to never disappear.k.It used to be indescribably massive.C.It is too large to be seen from space.D.It is growing over the last few decades.29.What are the effects of rising temperatures?A.Changes in the shape of coral.B.Increasing risk of coral death.C.Growing coral recovery capacity.D.Abundant food sources of corals.30.What does the underlined word "decisively"in the last paragraph refer to?A Decidedly.B.Gradually.C.Constantly.D.Regularly.31.What is the text mainly about?A.The temperature affects the life.B.Climate change causes warming oceans.C.Coral reefs face almost complete die-off.D.Extreme heat waves double greatly in number.英语试题第6页（共12页）

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