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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 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.
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.
Horny jaws function as teeth. 下颚充当了牙齿，下颚是牙齿的替代品
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.
function as teeth do --> they work in the same way as teeth do - same mechanics, same action, etc. this is not what is meant.
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.
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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i.e.,
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.
选错了，自己查了下，这样理解：这里的as不是连词，所以不能选D，function as sth.，起...的作用，作为，充当。
同意。as既可以作为连词，也可以作为介词。
当as做介词时，它只有一个意思，即，作为。As a teacher, James taught students history.
当as做连词时，连接句子，并且有很多意思：像、因为、当等。但是，做连词时，as不能表示“作为”。
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