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What can people know from the crown of an ancient tree found in New York? What possibly resulted in the evolution from leafless
What can people know from the crown of an ancient tree found in New York? What possibly resulted in the evolution from leafless
admin
2009-04-23
41
问题
What can people know from the crown of an ancient tree found in New York?
What possibly resulted in the evolution from leafless tree to flat leaves?
选项
A、The decrease CO2 in levels.
B、The increase of forests.
C、The drop of temperatures.
D、The change of climates like today.
答案
A
解析
根据题干中the evolution...to flat leaves,可以定位到末段第2句The drop CO2 in levels,he says, likely led to the evolution of flat leaves on trees to attract and retain more of the gas,which plants need.细节题。本句提到二氧化碳水平的下降可能导致了阔叶树木的进化,因为阔叶可以吸收并保持更多的植物所需的气体,故A正确。
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0
大学英语六级
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