题目

据报导我国最近合成多种元素的新同位素，其中一种是 （铪），它的中子数是（   ） A．72          B．113    C．185         D．257   答案：B解析:有关原子结构的简单计算，起落点低，只需仔细即可 假如你是高中一年级新生李华。开学之初，你的英语老师Rita 希望了解每位同学的英语学习情况，并征求教学建议。请按以下要点用英语给她写一封信。1.对英语学习的认识；2.自己目前的英语水平；3.自己英语学习存在的主要问题；4.对英语教学的两点建议。注意：1. 词数100左右；2. 信的开头和结尾已给出。Dear Rita, I’m very happy to have you as our English teacher.______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Thank you!Li Hua