题目解析:
问题 A 有解释,第一段最后一句“…waves and tidal action cause blocks of ice to break off…”。问题 C 有解释,最后一段讲了 Amery Ice Shelf 特别适合出产绿冰山。问题 D 有解释,第五段第五句“Large concentrations of single-celled organisms with green pigments occur along the edges of the ice shelves in this region, and the seawater is rich in their decomposing organic material.。问题 B 没有解释,只是在第四段最后一句提到而已。