, these changes have important meanings for global timekeeping systems.The chang…

題目

, these changes have important meanings for global timekeeping systems.The changes may require adjustments to Coordinated Universal Time (UTC), potentially affecting satellitenavigation, telecommunications, trade, and space travel operations.41 A. satisfied B. unaware C. surprised D. impressiveTeenagers are often criticized for staying up late and sleeping in, but science shows there’s a biological reasonbehind this pattern. During adolescence, the brain’s internal clock shifts. Teens naturally begin to feel sleepy later atnight—sometimes not until 11 p.m. or even midnight. At the same time, they still need around eight to ten hours of sleepfor healthy development. This shift in sleep cycle, known as “delayed sleep phase,” often clashes with early schoolschedules. Many schools start before 8 a.m., which means students are frequently forced to function while still sleep-deprived. Studies have linked sleep deprivation in teens to poorer academic performance, increased irritability, and evenhigher rates of depression and anxiety.Some schools have experimented with later start times and seen promising results. Students reported feeling morealert, and teachers noticed improvements in both behavior and focus. Despite this, changes are slow to implement, largelydue to concerns about transportation, extracurricular schedules, and resistance from some parents and school officials.Understanding teen sleep patterns isn’t about making excuses. It’s about recognizing a real biological need. Ignoring itnot only affects learning but can also harm emotional well-being. By aligning school policies with scientific findings,we may improve both education and mental health outcomes for young people.

官方答案

• 答案：B. unaware

解析

空格前有 Although people are generally，後面接「這些變化對全球計時系統有重要意義」，前後形成讓步轉折：一般人通常「沒有察覺」，但這些變化其實影響深遠。unaware 意為未察覺、不知道，最符合語意。satisfied 是滿意、surprised 是驚訝、impressive 是令人印象深刻，都無法表達「人們一般並不知道」與後句「卻很重要」之間的對比。

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