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rabbitbug (兔八哥过Christmas?)
A (deficient) of folic acid (is rarely found) in humans (because) the vitamin is contained (in a) wide variety of foods.

it is one of structural questions in toefl test of 98.2
(#320278@0)
2002-1-2 -04:00
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Back To Topic: 一个语法:Collagen,a (strong) rubbery protein,(supports the) ear flaps and the tip (of nose) in (humans). 哪个错?

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