6口语：CLB 9 vs CLB 10 vs CLB 11（横向对比）同一个任务7提示语："Should children have homework on weekends?" — 三个分段的示例回答。

CLB 9（约75词，60秒口述）："In my view, children should not have homework on weekends, for two main reasons. First, kids spend five days at school already, and weekends are when they should rest, see family, and be active outside. Without that break, they get tired and concentrate less in class. Second, weekends are when most parents have time to spend with their children. If kids are doing homework, that family time disappears. So overall, I think weekends should be homework-free."

CLB 10（约85词，60秒口述）："In my view, children genuinely shouldn't be assigned homework on weekends, for two reasons that matter more than they're often credited for. First, school already eats five days of a child's week, and the time off is what allows them to recover, get outside, and just be kids. Without that, attention in class actually drops by Monday. Second, weekends are usually the only window where families spend uninterrupted time together. Tying that up with worksheets quietly erodes that time. So weekends should stay homework-free."

CLB 11（约95词，60秒口述）："Honestly, I'd argue children shouldn't have homework on weekends, and the reasoning isn't really about academics — it's about cognitive recovery and family time. After five days of structured learning, the brain genuinely needs unstructured time to consolidate what it's learned. Studies on attention in children consistently bear this out. On top of that, weekends are often the only stretch where families share unrushed time, and homework quietly compresses that window. So while the intention behind weekend assignments is well-meaning, the trade-off rarely justifies the cost."

从9到10到11的变化：词汇精准度（"recover" → "cognitive recovery"）、语法多样性（更多被动句、限定语和复杂结构）、自然度（CLB 10-11 中自信使用"kids"，"I'd argue"和"isn't really about"等限定短语真实自然）以及修辞手法（让步、限定、引用证据）。