I. 下面描述的学科名称是什么？
1. It tells us the mystery of life._______
2. It focuses on the reactions between different materials. _______
3. It study what happened to the earth in the different times of history._______
4. It mainly deals with numbers. ______
5. It is a language mainly spoken in Russia. ______
II. 下面的四个选项哪一个是语境中最合适的？
1. Only those who are _____ can arouse enthusiasm around them.
A. continuous B. persistent
C. enthusiastic D. insistent
