①原始农业产生后，中国黄河流域率先栽培的主要农作物是____，长江流域率先栽培的主要农作物是____。

②半坡遗址的先民住____房屋，河姆渡遗址的先民住____房屋。

    In 1955 in Montgomery, Alabama, only white people were ____ to sit in the first four rows of public buses. African-American people had to use the seats towards the ____ of the bus.

    If someone ____ was African-American sat in the white part, he or she would be asked to move.

    One day, an African-American named Rosa Parks was ____ in a “whites only” part of the bus.

    The bus was ____ and some white people needed a seat, so the driver asked Rosa Parks to give ____ her seat.

    But she refused. She was ____ after a long day working in a store and she felt she should have the right to sit ____ she wanted, so she told the driver “no”.

    For that, she was arrested (逮捕). She was tried for just 30 minutes and fined (罚款) $10—a lot of money in those days.

    She also ____ her job because of that.

    Today, in the United States, December 1 is a ____ called Rosa Parks Day. Rosa Parks is celebrated for her action and bravery.

小明和小李、小凯三人读同篇朗读稿，小明用了$\frac{2}{15}$小时，小李用了$\frac{1}{6}$小时，小凯用了$\frac{3}{10}$​小时，谁读得最快？（　　　　）