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题库 / Prep2007E2-SC-120
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.
their horny jaws function for teeth
its horny jaws function for teeth
its horny jaws function as do teeth
the horny jaws function as teeth do
the horny jaws function as teeth
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function as sth.，起...的作用，作为，充当
function as teeth --> they work as an acceptable substitute for teeth
function as teeth do --> they work in the same way as teeth do - same mechanics, same action, etc. this is not what is meant.
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