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第三部分：阅读理解（共20小题;每小题2分, 满分40分） 阅读下列短文，从每篇短文后所给各题的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。 MEXICO CITY： A jetliner from the beach resort of Cancun was briefly hijacked as it landed in Mexico City on Wednesday. The hijackers released all passengers shortly before federal police stormed the plane, and the crew emerged unharmed moments later. Police, who did not fire a single shot, led as many as eight handcuffed men away from the airplane, which was isolated at th 下列历史现象中，体现明清时期社会发展趋势的是 [　　] A．李自成提出“均田免粮” B．建州女真进入辽沈地区 C．苏州的“机工出力、机户出资”现象 D．白银成为普遍流通的货币