* Crude oil prices continue to fall, Brent near 4-year low* Dollar retreats on global growth concern, Fed views* Trade data eases worries over China slowdown(Updates prices, changes comment)By Rodrigo CamposNEW YORK, Oct 13 (Reuters) - The U.S. dollar weakened on Monday after comments from Federal Reserve officials drove views that interest rate hikes could be delayed, lifting pressure off metals