古代时，由于无法解释日食成因，人们迷信地认为日食是-种凶兆．现在我们可以用光的 ____来解释日食的成因，如图所示。有乒乓球、足球和瓦数较大的白炽电灯，请你用这三种物品代表相应的星球，设计出观察日食成因的实验，并根据三个星球排列的位置，按示例，把答案填写在横线上。
用 ____代表 ____；用 ____代表 ____。

    Sometimes talent runs in families. Let's look at some famous (著名的) brothers and sisters.

    Andy Murray and Jamie Murray are very famous brothers. They are both professional (职业的) tennis players and they play in competitions all over the world. Jamie is older than Andy, but only by about a year. They look very similar. They are the same height and they have the same dark hair. Jamie became a professional player in 2004, one year before his younger brother Andy. But Andy wins more competitions than his brother!

    Kylie Minogue and Dannii Minogue are famous Australian sisters. Kylie began her career (事业) as an actress on Australian TV, then she began singing when she was 19 years old. She soon became famous all over the world. Dannii is younger than Kylie. She is also taller than her sister and she has darker hair. She began singing after Kylie, but she is also very famous. Dannii is also famous as a judge (评判员) on TV talent shows. Sometimes Kylie and Dannii sing together, and they sing really well.

呼吸道对气体的处理能力是有限的．（判断对错）

伟大物理学家牛顿最早发现了光的色散现象，它属于（   ）