四、情景交际(共5小题,每小题1分,计5分) 从下列选项中选择适当话语使对话完整,其中有一多余的。 A:Ann,you look sad,1____ B:I didn't pass the math exam.It's difficult for me to learn math well.2____ A:Don't worry.Maybe I could help you.You know I do well in math. B:3____.Thank you very much. A:You're welcome. B:But I have another problem.4____ A:Why? B:I often stay up late playing computer games at night. A:Oh,it's bad for your health.5_____ B:OK.I'll have a try this night. 选项: