题目

根据对话内容，在空白处填写一个适当的话语（话语可能是一个单词、一个短语或一个句子），使对话完整。（10分）A: Hello, Sally! Congratulations to you on winning the first prize in the speech contest!B: Thank you. A: You 【小题1】__________________ be shy when you talked to others. Why did you take part in the speech contest?B: Yeah, I were shy years ago. And my mother was really 【小题2】__________________ it. She told me I must have confidence in everything. She encouraged me to do that.A: How could you do such a good job?B: I practiced the 利用生活中常见的材料可以进行很多科学实验，下图就是一个用废旧材料制作的可用于驱动玩具的电池示意图。当电池工作时，有关说法正确的是（ ）A．铝罐将逐渐被腐蚀B．该电池驱动电动玩具时,石墨棒应与玩具电机的负极相连C．石墨棒上发生的反应为：O2－4e－＋2H2O== 4OH－D．该电池工作一段时间后石墨棒的质量会减轻