【题目】So large is the Pacific， 30% of the earth’s surface，that the energy generated by its warming is enough to touch off a series of weather changes.
A. covered B. covering
C. having covered D. being covered
在线课程【答案】B
【解析】考查现在分词。句意为：太平洋是如此之大，覆盖了地球30%的表面，以至于它的升温所产生的能量足以引发一系列的气候变化。the Pacific与cover之间存在主动关系，应用现在分词作定语。