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dying of being5 . Scientists estimate (估计) that so far more than 140 giant panda...

、要有整体观，要瞻前顾后，先易后难。做题时，文章首句和尾句要特别注意，前者往往是文章全貌的窗口，后者往往是起画龙点睛作用和总结性句子；先易后难指的是没有把握的选...

arn the rulers. ___But___ if you want to be good, you have to practice for years...