题目

  10.—Did you make sense of what the man said just now? —No, his meaning didn’t_______. Would you explain it to me?       A.get through               B. get off                            C. get across                 D. get out 答案：C用化学符号表示下列微粒：①2个氢原子________； ②两个亚铁离子________；③标C60中碳元素的化合价________； ④n个氧气分子________．