答案　B

　　Passage 16　(2017·浙江)

　　话题：兔子的困境

　　词数：505

　　(复活节) is still a great day for worship

　　And no，not because the kids like to pull their ears.The culprit is climate change，and some researchers found that rising temperatures are having harmful effects on at least five species of rabbit in the US.

　　Take the Lower Keys Marsh rabbit，for instance.An endangered species that lives in the Lower Florida Keys，this species of cottontail is a great swimmer—it lives on the islands！—but it is already severely affected by development and now by rising sea levels.According to the Center for Biological Diversityl rise of only 0.6 meters will send these guys jumping to higher ground and a 0.9－meter rise would wipe out their habitat (栖息地) completely.

　　he wintertime to brown in the summer，each designed to give them better cover from predators (捕食者).As the number of days with snow decreases all across the country and spring，making them an easier mark for predators.Researchers know that the color change is controlled by the number of hours of sunlight，but whether the rabbit will be able to adapt quick enough to survive is a big question.The National Wildlife Federation has reported that hunters have noticed their numbers are already markedly down.

　　American pikas or rock rabbits，a relative of rabbits and hares，might be the first of these species to go extinct due to climate change.About 7－8 inches longh in the cool，damp mountains west of the Rocky Mountains.As global temperatures rise，they would naturally migrate (迁移) to higher ground—but they already occupy the mountaintops.They can't go any higher.The National Wildlife Federation reports that they might not be able to stand the new temperatures as their habitat heats up.

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