Research shows that not sleeping enough can lead to lower grades and negative moods. Because of this, some places have now encouraged schools to start later. Other places think early starts help busy families. We asked four students what they think.

Later starts sound nice, but school would end later too. Then there’s less time for sports, clubs, or hobbies. These activities teach students social skills. Also, waking up early is good! It gives you energy and helps you do more in the morning. — Tom,11

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1.1. What problem does lack of sleep cause according to the research?

A Higher grades.

B Bad moods.

C More energy.

D Fewer activities.

解析：选B。细节理解题。根据第一段的“not sleeping enough can lead to lower grades and bad moods”可知，研究表明，睡眠不足可能导致成绩下降和情绪低落。故选B。

2.2. Why does Alice think schools should start later?

A Kids need more sleep for health.

B Early starts help families.

C Students need after-school activities.

D Homework is too much.

解析：选A。细节理解题。Alice提到“You need more sleep to stay healthy and learn well”可知，睡眠对健康和学习很重要。故选A。

3.3. What does Anna worry about with later start times?

A Less after-school activities.

B More homework.

C Less sleep.

D Early end of school day.

解析：选A。细节理解题。Anna指出“A later start time means later end of school day. It would reduce the time they have for these activities.”较晚的上课时间意味着较晚的放学时间，这将减少他们从事这些课外活动的时间，即她担心课外活动时间减少。故选A。

4.4. Why can’t David go to bed early at night?

A Because his school starts late.

B Because he is often sick.

C Because he likes staying up late.

D Because he has much homework.

解析：选D。细节理解题。David提到“But schools give too much homework, so we stay up late finishing it.”但是学校布置的作业太多了，所以我们熬夜完成作业。由此可知他晚上不能早睡的原因是他有很多作业需要完成。故选D。

5.5. What does Tom think is a benefit of early starts?

A More free time.

B Better leaning skills.

C Morning energy.

D Less homework.

解析：选C。细节理解题。Tom提到“waking up early gives you energy and helps you do more in the morning”早起给你能量，帮助你在早上做更多的事情，他强调早起带来的精力，可以在早上做更多事情。故选C。