B.主要考察as +adj+n+as与n+as+adj+as的用法只要记住一点就明白了：as 必须且只能用来修饰形容词,如果as被用来修饰一个名词,肯定就错了.例如I can't buy as good a book as that one.这句正确,因为as是和good一起用...