What line of work are you in? http://tnaflix.in.net/ tnaflix  SAN FRANCISCO/HONG KONG, July 24 (Reuters) - A sharp drop inApple Inc's China revenue in April-June underscores thechallenges it faces in its second-largest market as thetechnology gap with cheaper local rivals narrows and as SamsungElectronics keeps up a steady stream of new modelsacross all price ranges.