BEIJING (AP) — Asian shares tumbled Monday after Italian voters' rejected constitutional changes, raising questions over whether Italy will stay in the European Union and keep using the euro. ITALY VOTES "NO": Italian voters rejected proposed constitutional changes, delivering a stinging defeat to Premier Matteo Renzi and galvanizing the populist opposition. China issued an unusually low-key complaint, saying it was a "small trick" by Taiwan, which the communist mainland claims as part of its territory. Market reaction was muted as trading began Monday on a new cross-border stock link between Hong Kong and the neighboring Chinese city of Shenzhen, widening access to China's markets for global investors. Australia's DUET Group, a pipeline operator and power distributor, received a takeover offer from Hong Kong billionaire Li Ka-shing's Cheung Kong Infrastructure that values the company at 7.3 billion Australian dollars (US$5.4 billion). Investors moved into safer assets Friday after government jobs data showed more hiring but weak wages. Investors have long expected the Federal Reserve will raise interest rates this month, and the jobs report did nothing to dispel that notion. Benchmark U.S.