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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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as 作介词表示作为，function as sth，作牙齿用，ok
as作连词，表示像……一样，因为，当……时，function as teeth do，像牙齿一样作用，这里应该就是当作牙齿用的意思
do sth for sb,为某人做某事，do sth for doing sth，表用途或原因，use the knife for cutting; thank u for coming.
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