98.As far as I know, no such drugs are ever known to work.

四級詞匯講解:
口語中經常以as far as I know作為一句話的開頭，意為“據我所知”，其后的內容便是說話的重點，這也正是聽力的常見設題點。no such…ever…意為“此類……從未……”，表示強調。句中的work意為“有效果，起作用”。

英語四級考點歸納：
聽力中與as far as I know類似的表達還有:

※ as/so far as I'm concerned意為“就我而言”。如:
So far as I'm concerned, I"m not going to run the program。就我而言，我不會去運 作這個項目。

※ as far as sb./sth. is concerned意為“就某人或某事物而言”。如:
As far as performance is concerned, we've done quite well.就表現而言，我們做得還不錯。

※ as far as it goes意為“就其本身而言”。如:
The statement is correct as far as it goes.該表述就其本身而言是正確的。