LONDON (Reuters) - World shares hit their highest in a month on Tuesday, as China promised fiscal action to support the world’s second-largest economy and stellar results from internet giant Alphabet underpinned tech stocks. FILE PHOTO: The London Stock Exchange Group offices are seen in the City of London, Britain, December 29, 2017. REUTERS/Toby Melville/File Photo Wall Street was set for a short climb when it reopens, with Google-parent Alphabet, part of the so-called FAANG stocks, expected to jump almost 5 percent after a better-than-expected quarterly revenue jump.