某同学做“验证平行四边形定则”实验情况如图甲所示，其中A为固定橡皮条的图钉，O为橡皮条与细绳的结点，OB和OC为细绳．
如图是测量小灯泡额定功率的实验装置，小灯泡上标有3.8V的字样．
选择句子补全对话。
A. Is it green? B. What do you see? C. What colouris it? D. Good morning, Alice.
Danny: ____
Alice: Good morning, Danny.
Alice: I see a bird.
Alice: No, it isn't.
Alice: It's red.
—Yes, it is ____ book.
①课后，告诉同学们，老师的讲解有误 ②课后，私下与老师交换意见
③打断老师的讲解，指出老师的错误 ④等老师讲解结束后，向老师提出你的疑问
