根据句意及首字母提示填词。

1. It's a q____ to two. Let's go to school.

2. Monkeys like eating b____. They are very clever.

3. —I'd like a b____ of apple juice. What about you, Jack?

    —Milk for me, please.

4. —Can I help you, m____?

    —Yes, please. I want to buy a dress for my daughter.

5. —What are your f____ animals, Yangyang?

    —Monkeys, I think. They're very clever.

关于天然放射现象，下列说法正确的是[ ]

A．是玛丽·居里夫妇首先发现的

B．首次说明了原子核不是单一的粒子

C．γ射线必须伴随α射线或β射线而产生

D．任何放射性元素都能同时发出三种射线