66. C。细节理解题。根据第一段的But then, the two could just not contain their excitement.可知那两只大猩猩见到彼此非常高兴。
67. B。推理判断题。根据第二段的In the three years he was away, he turned from a small 285-pound blackback gorilla to a handsome 485-pound silverback.可知Kesho的模样发生了很大的变化。
68. C。推理判断题。根据第三段的The park officials were not sure if Alf would even recognize him. They first introduced them by placing their cages across each other.可推断动物园的管理人员不知道大猩猩可以很容易认出彼此。