题目

________ is a pity that you forgot both her address and her telephone number.     A. It B. There C. This D. That   答案：A请用合适的化学用语填空：（1）3个铜原子_____（2）碳酸根离子_____（3）2个亚铁离子_____（4）水分子的微粒符号_____