Filed under: Before the bell, Major movement, Earnings reports, Analyst upgrades and downgrades, Google (GOOG), Wal-Mart (WMT), Amazon.com (AMZN), Merrill Lynch (MER), Whole Foods Market (WFMI), Yum Brands (YUM), Verizon Communications (VZ), Contl Airlines'B' (CAL), RadioShack Corp (RSH)Main market news here.Verizon Communications Inc. (NYSE: VZ) reported an 8.4% drop in first-quarter earnings to $1.5 billion, or 51 cents a share. Excluding charges, net income totaled $1.63 billion or 56 cents a share, for the latest quarter, down from a year-ago equivalent profit of $1.75 billion, or 60 cents a share. Operating revenue rose 6.4% in the latest three months to $22.58 billion. Analysts estimated Verizon to earn 53 cents a share on revenue of $22.49 billion. VZ shares are up 1.2% in pre-market trading.RadioShack Corp. (NYSE: RSH) reported ...