* U.S. stocks closed higher across the board; * Moody's downgrades U.S. credit rating to Aa1; * Consumer confidence dropped to the second lowest in history. On Friday, the three major U.S. stock indexes closed higher across the board, the Dow Jones Industrial Average turned up during the year, and the S&P 500 Index recorded five consecutive positives. On the one hand, the market expects the global trade situation to get more clear signals in the coming weeks, which will drive the broader market to rebound; On the other hand, the University of Michigan's consumer confidence index was weaker than expected, narrowing gains in major stock indexes. By the close, the Dow rose 331.99 points, or 0.78%, to close at 42,654.74 points; The Nasdaq rose 98.78 points, or 0.52%, to close at...

