题目

Chinese students aren’t the only ones who have a sleep loss problem. In Australia, teenagers are also missing out on, on average, one hour’s sleep every night during the school week.    Organized activities and homework push bedtimes later, the first large-scale Australian study of children’s sleeping habits has revealed (显示). Their sleep deprivation (剥夺) is enough to cause “serious drop-offs in school performance, attention and memory”, and governments should consider later or flexible school start times, said the study’s leader, Tim Olds.    His survey, of more than—Tony, I really appreciate your wonderful performance in the concert． —_________．A．I've practiced for agesB．Well, it's just so-soC．No, I don't think soD．Thank you very much