北师大版高中英语选修6 Unit18 Lesson1：It is hard to imagine that they would be seen as attractive in the 21^st century.中as 后为什么接形容词attractive？

 解释：

上句中as为副词，[用于范围或程度的比较] 如同，如

It tasted like grape juice but not as sweet. （=…but it was not as taste as grape juice.）

这尝起来像葡萄汁，却不及葡萄汁甜。《新牛津英汉双解大词典》

其它例句：

Think about Stephen Hawking, for example, a very clever scientist who regards his many physical problems as unimportant.

In doing my reading, I often mark out what I regard as important in a book.

读书的时候，常在书上把我所认为要紧的处所标出。