《云南省重大行政决策程序规定》由省政府常务会议讨论通过，并于2016年6月10日正式施行。玉溪市结合自身实际，制定《玉溪市重大行政决策程序规定（试行）》指出，县级以上人民政府对涉及本行政区域经济社会发展全局，与公民、法人或者其他组织利益密切相关的重大事项作出决定的行政行为，需在决策作出前，履行公众参与、专家论证、风险评估、合法性审查、集体讨论决定的法定程序。

设a、b是两条不同的直线，$\alpha$、$\beta$是两个不同的平面，给出下列结论：
①a∥b，b$\subset$$\alpha$ ⇒a∥$\alpha$；
②$\alpha$∥$\beta$，a∥$\beta$，$\alpha$⇒a∥$\alpha$；
③$\alpha$$\cap$$\beta$＝a，b∥$\alpha$，b∥$\beta$⇒b∥a；
④a∥$\alpha$，b$\subset$$\alpha$ ⇒a∥b.
其中正确的有(　　)

根据短文理解，选择正确答案。

    An old lady in a plane had a blanket（毯子）over her head and she did not want to take it off. The air hostess spoke to her, but the old lady said, “I have never been in a plane before, and I am frightened. I am going to keep this blanket over my head until we are back on the ground again!”

    Then the captain came. He said, “Madam, I am the captain of this plane. The weather is fine, there are no clouds in the sky, and everything is going very well. ”But she continued to hide.

    So the captain turned and started to go back. Then the old lady looked out from under the blanket with one eye and said, “I am sorry, young man, but I don't like planes and I am never going to fly again. But I'll say one thing,” She continued kindly, “You and your wife keep your plane very clean!”