To live through cold weather，plants have develop three strategies，Se plants，ch as oak trees, avoid freezing damage by dropping their leaves, before the winter chill sets in-effectively shutting off the flow of water between roots and leaves—and growing new leaves and water transport cells when the warm spring returns. Other plants, pine trees for example, protect them-selves by narrowing their water transport cells, which makes it easier for cells to travel among air bubbles．The third stratef;yi8 also the most extreme．Some plant; die on the ground in winter and start growing as new plants from seeds when conditions get warmer．

　　Howeer, these smart strategies were developed nmry8lowly－over millions of years of evolution．This eads scientists to worry that plants may not be able to deal with human-caused climate change, which has only started occurring over the past few decades．Scientists are hoping o find possible ways to save plants from the threat of climate change．

　　1．What is the text mainly about?

　　A．Different ways for peopkeep warm．

　　B．How plant live through the freezing winter．

　　C．How plants develop the 8tratef;ies to keep warm*

　　D．The ways to save plantsrom the cold,

　　2． the water transport from roots to leaves 18 blocked,

　　．

　　A．the plant will suffer from f'rostbite

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