What is the main cause of climate change?
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How much greenhouse emissions wil increase due to the loss of forest?
What are the effects of climate change?
What are the major typles of pollution?
在飞行中，颠簸可分为两类（）
A. 可控颠簸和不可控颠簸
B. 轻度颠簸和严重颠簸
C. 地面颠簸和空中颠簸
D. 可预知颠簸和突发性颠簸
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