Do you know when the best time for dinner is? Some studies say we should finish dinner before 5 p.m.

If you eat dinner early, your body works better. Your blood sugar levels will stay stable (稳定的) and your weight will stay healthy. Eating late is bad for your body. It may harm your stomach and heart, and weaken (削弱) your bones.

1.1. What is the best time to finish dinner?

A Before 5 p.m.

B Before 7 p.m.

C After 5 p.m.

D After 7 p.m.

解析：选A。A细节理解题。文章第一段直接说明“Some studies say we should finish dinner before 5 p.m.”，并在第二段具体阐述早吃晚饭的好处，因此吃晚饭的最佳时间是下午5点前，A正确。B项before 7 p.m.是退而求其次的建议，不是最佳时间；C和D的after 5 p.m.和after 7 p.m.都与文意相反，排除。故选A。

2.2. If Tom eats dinner at 9 p.m., what may happen?

A He will feel excited.

B His body may not work well.

C He will become taller.

D He will want more vegetables.

解析：选B。B推理判断题。题干说汤姆晚上9点才吃晚饭，这属于文中所说的“Eating late”。根据第二段的“Eating late is bad for your body. It may harm your stomach and heart, and weaken your bones.”可以推断，他的身体可能会出现不适，即“His body may not work well.”，所以B正确。A项“兴奋”在文中完全没有依据；C项“变高”与骨头变弱的事实矛盾；D项“想要更多蔬菜”将后文建议与晚期危害混淆，文章并未说晚吃会让人想吃蔬菜，排除。故选B。

3.3. What does the underlined word “light” mean in the passage?

A 明亮的

B 清淡的

C 轻的

D 浅色的

解析：选B。B词义猜测题。画线词“light”出现在第三段中的“Eat more vegetables and light food.”中，前文提到晚饭不要吃太多，要多吃蔬菜。这里的“light food”与油腻、难消化的食物相对，结合“Have an early and light dinner every day!”的语境，可判断“light”意为“清淡的”。A项“明亮的”、C项“轻的”和D项“浅色的”分别对应“light”的其他义项，但在本文的饮食健康语境下均不贴合，所以选B。

4.4. What is the passage mainly about?

A When to eat dinner.

B What to eat for dinner.

C How to cook dinner.

D Why early dinner is important.

解析：选D。D 主旨大意题。文章虽然提到了晚饭的时间（A）和内容（B），但这些都是为了说明核心观点：早吃晚饭为什么重要、晚吃有什么危害，以及由此给出的建议。全文围绕早期晚饭的好处和晚期晚饭的害处展开，最后用“Have an early and light dinner every day!”总结呼吁，因此主旨是“Why early dinner is important.”，D正确。A和B都只概括了部分内容，C项的“如何做晚饭”文中完全没有涉及，不选。故选D。