Although the turtle has been toothless for more than 150 million years, in some contemporary turtle species the moderately sharp and jagged edges of their horny jaws function for teeth.
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ypheroin 2016-01-16 12:06:04
我觉得解析说their与the turtle不一致，这里我倒是觉得their指代的是contemporary turtle species （当然最好是没有代词，因为specie是介词短语的成分）但后一句让步里说的情况明显不是在说the turtle，因为their与turtle不一致就认定该选项是错的显然不对。该选项的错误应该是function for不对。
