CAPTCHA was developed by AltaVista in 1997 to eliminate bots trying to add spam URLs to search engines. It is said that introduction of CAPTCHA was able to prevent more than 90% of URL addition by bot ...
01:Since it can not be read, it is a CAPTCHA image that gradually disappears as it is reloaded and becomes extra worse. 02:can not read. 03:With a message of anger saying "How to input". 04:A CAPTCHA ...
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