Hello. I'm Lucy. Let's meet my family. I'm twelve years old. My year is the year of the pig. My mother is thirty-six years old. Her year is also the year of the pig. My father is thirty-seven years old. His year is the year of the dog. My brother is two years old. His year is the year of the rooster.

⑴Lucy ____       A.12      a.

⑵Father ____     B.2        b.

⑶Mother ____    C.37      c.

⑷Brother ____    D.36     

①创新是民族进步的灵魂          ②创新是国家兴旺发达的不竭动力

③只要创新企业就能走向成功  ④创新是我国民族精神的核心

一个不透明的袋子里装有50个黑球，2个白球，这些球除颜色外其余都完全相同．小明同学做摸球试验，将球搅匀后，从中随机摸出一个球，记下它的颜色后放回袋中，然后再重复进行下一次试验，当摸球次数很大时，摸到白球的频率接近于（　　）