问题 选择题

下列实验基本操作正确的是[ ]

A.把浓硫酸倒入盛有水的量筒里稀释

B.用排水法或向上排空气法收集氧气

C.将胶头滴管伸入试管内滴加液体

D.用手直接抓粉末状药品放入试管

答案

答案:B

材料分析题

王平在小学时,学习成绩一直很优秀,同学们很佩服他,也经常受到老师的表扬。进入初中后,由于学习难度加大,竞争对手越来越多,王平的成绩下降了,老师对他的表扬越来越少了。王平从来没有过这样的感受,这无疑是一个重大打击,于是他便闷闷不乐,产生了辍学的念头……

(1)王平遇到挫折的主要原因是什么?

                                                                                                                                                               

(2)请你告诉王平应该怎样对待挫折。

                                                                                                                                                              

                                                                                                                                                             

                                                                                                                                                             

判断题