Language Point 21
... some people worry that the Internet, once hailed as the ultimate learning tool, could become the best aid yet for cheating. (Para. 8)
Meaning: ... some people worry that once the Internet was recognized as the final learning tool, it could become the best helper to students for cheating.
hail: vt. 1. recognize (someone) as important by calling out (a name of honour)
They hailed him king.
2. call out to (someone) by name or in greeting 招呼
An old friend hailed me from the other side of the street.
hail as: recognize (something) as (something good) 认为；赞扬
They hailed it as a work of art.
She's being hailed as one of the best promising young dancing stars today.