The information of the global climate conditions in the past can be obtained(获得)through _________．A.separating carbon dioxide from the airB.examining the growth ringsof treesC.paring temperatures in different areasD.studying the ice and air caught in each layer
网友回答
D解析这是一道细节推断题。根据第三段“And the ice and air caught in each layer have begun to answer questions about the climates in the past．”可判断出对沉积在各层的雪和对空气的研究可知道过去气候的状况。