单词拼写。

1. It was _________(安排)that they should leave the following spring.

2. Harry Potter lives in a _________(幻想) world, which is totally different from ours.

3. As beginner of a second language, you have many difficulties to _______(克服).

4. The villagers here _________(依赖) on wells for their water at present.

5. They found themselves _________(包围)by colorful rocks, fishes, seashells and plants.

6. When water __________(结冰), its density decreases.

7. Mixed -race m_________were forbidden by law.

8. The nutrients in whatever falls into the ocean will quickly become a______ to other living creatures.

9. There was little change in their d________lives.

10. Their ages r________from 25 to 50.

能维持人体正常的新陈代谢和神经系统正常生理功能的营养物质是(   )

A．维生素C

B．维生素B₁

C．维生素A

D．维生素D