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Shares of Amazon (AMZN), Alphabet ([[GOOG]], [[GOOGL]]), Apple (AAPL) and Facebook (FB) - worth nearly $5T in combined market capitalization - added to gains yesterday even as their chief executives defended themselves in Congress against antitrust allegations. The real test will come today, when the Big Tech companies report Q2 results after the market close. On watch will be figures and trends in e-commerce, streaming, advertising, search, app