用适当的代词填空。

1. I’m a nice girl. ________ mother likes me very much.

2. He’s Chinese. ______ father is a worker.

3. I don’t know ______ telephone number, Tom.

4. ---Are you students?

    ---Yes, ______ are.

5. Anna is a good student. ______ brother is Peter.

食糖在热水中比在冷水中溶解得快些，说明了：[ ]

A.热水比冷水流动得快

B.分子间的作用力与温度有关

C.温度越高，分子运动越快

D.热水分子间的间隙比冷水分子间的间隙大