烛焰通过凸透镜在另一侧的光屏上成一个倒立放大的像，如果保持凸透镜的位置不变，只将蜡烛和光屏的位置相互交换，那么（   ）

平时我们吃西瓜里面有很多粒种子，这是因为（    ）

    Hello! My name is Kim. I'm from the U. S. I am a tall girl. I like basketball best. I often play basketball with my friends on the playground. We have two teams—the White Team and the Yellow Team. I am on the Yellow Team. Each team has five players. My favourite basketball player is Yao Ming. I like him best and I want to be a basketball player like him.

读课文《中国人失掉自信力了吗》，联系上下文体会划线词语的意思。

①一到求神拜佛，可就玄虚之至了。

玄虚：____

②他们在前仆后继地战斗，不过一面总在被摧残，被抹杀。

前仆后继：____

③状元宰相的文章是不足为据的，要自己去看地底下。

不足为据：____