下列各组物质关系中,与O2和O3关系相同的一组是[ ]
A.Na和Na+
B.S4和S8
C.
D.水和重水
答案:B
单词拼写 (满分10分)
1. Water has three states: gas , liquid and (固体). 66.
2. The high-quality (飞行员)are badly needed. 67.
3. I’d like to buy two (打)eggs. 68.
4. The people’s (平均)income is increasing year by year. 69.
5. Women like (讨价还价) 70.
6. The village was surrounded by (敌人). 71.
7. The goods are paid by (支票). 72.
8. Tom shares everything with us (自愿地) 73.
9. Cellphones are (禁止) at school. 74.
10. As is known ,nobody is (完美的) 75.