D. The many spare teeth lying in seemingly limitless reserve in the shark’s jaws,
each one of which is ready to slide into the appropriate position whenever an active tooth is lost or worn down.
D问题有2个。1. each 在jaws后产生歧义 2 each one按照OG的解释是redundant
-- by 会员 bdsjb116 (2010/9/15 23:05:28)