KEY TAKEAWAYSChina-focused exchange-traded funds (ETFs) and U.S. listed-Chinese stocks surged Tuesday, buoyed by Beijing's broad stimulus package to boost the country's sluggish economy.The $4.4 billion iShares MSCI China ETF (MCHI) and the iShares China Large-Cap ETF (FXI), with roughly$4 billion in assets were both up around 6%.The measures included cuts in a key short-term interest rate and lower rates on existing mortgages amid an economic slowdown driven by a housing market slump.China also lowered th ...