That day they walked as far as ten kilometers in two hours.

　　考例：(2005安徽)John is the tallest boy in the class，_______according to himself.

　　A.five foot eight as tall as B.as tall as five foot eight C.as five foot eight tall as D.as tall five foot eight as

　　【解析】选B.as…as中间要用形容词/副词的原级。

　　四.引导时间状语从句

　　含义为“当…的时候，如：

　　1.I watched her as she combed her hair.

　　2.As he grew older ，he lost interest in everything except gardening.

　　考例：1.(NMET1994)Mother was worried because little Alice was ill，especially____Father was away in France.

　　A.as B.that C.during D.if

　　【解析】答案是A.“在……时候，相当于when.而C选项是介词，不接句子。

　　2.(MET90)_____the day went on，the weather got worse.

　　A.With B.Since C.While D.As

　　【解析】答案是D.“随着的意思，as the day went on可以作为固定结构记住。

　　五.作介词用

　　有“作为，当作的意思。如：

　　1.They were all dressed as clowns.他们都打扮得如小丑。

　　考例：(2005广东)I feel that one of my main duties_____a teacher is to help the students to become better learners.

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