Although online classes have existed for more than a decade，the concern over cheating has become sharper in the last year with the growth of “open online courses.” Private colleges，public universities and corporations are jumping into the online education field, spending millions of dollars to attract potential students，while also taking steps to help guarantee honesty at a distance.

　　Aside from the web cameras, a number of other high－tech methods are becoming increasingly popular. Among them are programs that check students' identities using personal information，such as the telephone numbers they once used.

　　Other programs can produce unique exams by drawing on a large list of questions and can recognize possible cheaters by analyzing whether difficult test questions are answered at the same speed as easy ones. As in many university classes，term papers are scanned against some large Internet data banks for cheating.

　　41．Why was Jennifer watched in an online exam?

　　A．To correct her typing mistakes.

　　B．To find her secrets in the room.

　　C．To prevent her from slowing down.

　　D．To keep her from dishonest behaviors.

　　42．The underlined expression cutting edge in Paragraph 3 is closest in meaning to ________．

　　A．advanced technique

　　B．sharpening tool

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