参考答案：F

解析：[听力原文]
We would like to remind instructors that student attendance constitutes 10% of the final grade. Please keep informing your students also about this. Stress the fact that since they’re language learners, it’s important for them to come to class as frequently as possible. Otherwise we cannot be held responsible for any negative results of our teaching on them. Please take attendance every morning and don’t hesitate to mark them absent in case they’re still not in class by the time you’ve finished calling out their names. This way you don’t waste time with the attendance ritual every morning.