Netizens are frequently reminded to be about revealing (透露) their personal information on the Internet.
A. strict
B. severe
C. cautious
D. positive
网友回答
A. strict
B. severe
(答案→)C. cautious
D. positive
解析：形容词辨析。Be cautious about对…小心谨慎。A严格的（与with连用）；B严重的；D积极的；句意：网民们经常被提醒在网上透露个人信息的时候要小心谨慎。故C正确。