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You may often hear about the dangers of too much sun. However, getting the right amount of sunlight is actually very good for your health. It helps your body and mind in many important ways.

First of all, sunlight helps our bodies make vitamin D. This vitamin is very important for strong bones because it helps us use calcium from food. Vitamin D also helps keep our immune (免疫的) system strong and supports a healthy heart and brain. We call it the “sunshine vitamin” because sunlight is the best way to get it.

Besides vitamin D, sunlight has other benefits. It can make us feel happier and improve our sleep. In the morning, bright light helps set our body’s natural clock. This tells our body when to be awake and when to feel sleepy at night. Sunlight can even help clean the air inside our homes by reducing bacteria (细菌) in dust.

Doctors also believe sunlight may help lower high blood pressure and keep our weight healthy. While more research is needed, we know that people who spend time outside in the sun often feel better and more active. It is important, though, to enjoy the sun safely.

The right amount of time in the sun is different for everyone. People with lighter skin may need about 10 to 15 minutes a day. Those with darker skin might need a little longer, about 25 to 40 minutes. Remember to use sunscreen if you stay outside for more than a short time. By enjoying sunlight wisely, we can all receive its wonderful health gifts.

1.1. What is people’s common belief about sunlight?

A It is necessary for health.

B It is mostly harmful.

C It only helps the mind.

D It has no danger at all.

解析：选B。1.B细节理解题。文章第一句“You may often hear about the dangers of too much sun”直接表明人们常听到的是过度晒太阳的危害，即普遍认为阳光大多是有害的。A、C、D 选项均与文章开头传达的常见观点不符。故选B。

2.2. How does Vitamin D work for our bones?

A It makes bones grow fast.

B It helps use food calcium.

C It takes the place of calcium.

D It stops bones from breaking.

解析：选B。2.B细节理解题。第二段明确提到“it helps us use calcium from food”，说明维生素D的作用是帮助身体利用食物中的钙，从而强健骨骼。A、C、D 选项在文中均未提及。故选B。

3.3. Which is NOT mentioned as a benefit of sunlight in Paragraph 3?

A Making people happier.

B Improving sleep quality.

C Cleaning air indoors.

D Improving memory.

解析：选D。3.D细节理解题。文章第三段依次提到阳光的益处：“It can make us feel happier（让人更快乐）”、“improve our sleep（改善睡眠）”、“Sunlight can even help clean the air inside our homes by reducing bacteria in dust（帮助清洁室内空气，减少灰尘中的细菌）”，分别对应 A、B、C 三个选项。而 D 选项 “Improving memory.（改善记忆力）” 在第三段中完全没有提及，因此 D 为正确答案。

4.4. What is the writer’s advice for enjoying sunlight?

A Stay outside as long as possible.

B Enjoy it with safety in mind.

C Always ask a doctor first.

D Do more research on it.

解析：选B。4.B细节理解题。文章第四段明确提出 “It is important, though, to enjoy the sun safely.”，第五段又进一步给出不同肤质的晒太阳时长和涂抹防晒霜的安全提示，核心建议都是要安全地享受阳光，与 B 选项 “Enjoy it with safety in mind.（享受阳光时牢记安全）” 相符。故选B。

5.5. People with darker skin need ________ to get enough sunlight.

A less time

B a special time

C longer time

D stronger sunscreen

解析：选C。5.C细节理解题。文章第五段提到 “People with lighter skin may need about 10 to 15 minutes a day. Those with darker skin might need a little longer, about 25 to 40 minutes.”，明确指出肤色较深的人需要更长的晒太阳时间，对应 C 选项 “longer time（更长的时间）”。故选C。