小丽站在竖直放置的平面镜前1m处，当她向平面镜走近0.5m时，她与平面镜中像之间的距离为（　　）

地球自转的方向是（　　）

①自西向东  ②自东向西③从北极上空观察呈顺时针方向  ④从南极上空观察呈顺时针方向．

阅读短文，下列问题

（C）

    I like sports. I have ten tennis balls, seven basketballs, four volleyballs and five soccer balls. I play tennis with my friends every day.

    I have five baseballs, five volleyballs, two soccer balls. I like ping-pong. It's easy for me. I often play ping-pong with my classmates. I also(也) have three ping-pong bats and some ping-pong balls.

    I don't have any(任何的) balls. I love sports, but I don't play them. I only watch them on TV.

材料一:马克思说: “火药,罗盘针,印刷术——这是预兆资产阶级社会到来的三项伟大发明。火药把骑士炸得粉碎，罗盘针打开了世界市场并建立了殖民地, 而印刷术变成新教的工具,变成科学复兴的手段，变成制造精神发展的必要前提的最强大的推动力。”

材料二:“外国用火药制造子弹御敌，中国却用它作爆竹敬神；外国用罗盘针航海,中国却用它来看风水；外国用鸦片治病,中国却拿来当饭吃……”

——鲁迅

结合所学知识,请回答: