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[填空题]California has more than two thousand (47) of plants that are not found anywhere else. A new study says climate change could severely (48) these plants by the end of the century. Many could move northward and toward the Pacific coast in reaction to rising temperatures and (49) in rainfall. Others might climb up mountains to find the cooler climates they like.
But David Akeley at the University of California, Berkeley, says the (50) of climate change is greater than during ice ages in the past. He says plants that cannot move fast enough are in (51) of getting killed off before they can relocate. Changes in plants could also affect animals that depend on the plants for food.
About forty percent of all (52) plants in California are endemic, meaning that they are found only in that state. The new study says that for two out of three endemic plants, the areas where they are found could (53) by more

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