It was winter, and Mrs. Smith wanted to do a lot of shopping. She waited until it was Saturday, when her husband was free, and she took him to the shops with her to pay for everything and to carry for her what she would buy. They went to a lot of shops, and Mrs. Smith bought everything she could think of. She often stopped and said, "Look, Peter! Isn't that beautiful'?"

    Mr. Smith then answered, "All right, my dear.  How much is it?" And he took out money to pay for it.

    It was almost dark when they came out of the last shop, and Mr. Smith was tired. He was thinking about a nice drink by the side of a warm fire at home. Suddenly his wife looked up at the sky and said, "Look at that beautiful moon, Peter. "

    Without stopping, Mr. Smith answered immediately, "All right, dear. How much is it?" Then he took his wallet out of his pocket.

关于秦岭﹣淮河线的叙述，正确的是（   ）
①年平均气温0℃等温线

②湿润地区与半湿润地区的分界线

③亚热带与暖温带的分界线

④内流区与外流区的分界线．
    

1956年中共“八大”的召开，是探索建设社会主义道路的良好开端（   ）

已知函数f（x）=sin（x﹣φ），且${\int }_0^{\frac{2\pi }{3}}$$\underset{}{\overset{}{\frac{2\pi }{3}}}$ f（x）dx=0，则函数f（x）的图象的一条对称轴是（   ）