答案:A

解析:细节理解题。根据文中的"Those with a healthy glow had a higher presence of carotenoids(类胡萝卜素), which play a role in the immune system. "可知, 类胡萝卜素在免疫系统中起着重要作用。

5. According to the text, people preferred　　　.

A. the yellow skin color

B. the skin color as white as possible

C. the skin color enhanced by carotenoids

D. the skin color enhanced by suntans

答案:C

解析:细节理解题。根据文中的"Given the choice between skin color enhanced by suntans and skin color enhanced by carotenoids, people preferred the carotenoids skin color. "可知答案。

6. What can we learn from the text?

A. Young girls should not eat many melons.

B. There's no need to worry about our skin color.

C. We cannot judge a person from his appearance.

D. Skin color is a clue to judge whether a person is healthy or not.

答案:D

解析:推理判断题。根据文中的"The study shows that not only do people use skin color to judge how healthy other individuals are"可知, 皮肤颜色是判断一个人是否健康的线索。

7. What's the author's intention of writing this passage?

A. To share his experience of improving the skin.

B. To persuade us to get suntans every day.

C. To explain different diets in different cultures.

D. To show us how to get glowing skin.

答案:D

解析:写作意图题。本文在第一段点出主题:"The good news is that you don't have to wait until summer to catch some sun rays. Scientists have found eating plenty of fruit and vegetables is by far the best way to achieve a healthy, golden glow. ", 然后下文进行了具体介绍。故选D项。

　　Each time I see a balloon, my mind flies back to a memory of when I was a six-year-old girl. It was a rainy Sunday and my father had recently died. I asked my mom if Dad had gone to heaven. "Yes, honey. Of course, " she said.

　　"Can we write him a letter?"

　　She paused, the longest pause of my short life, and answered, "Yes. "

　　My heart jumped. "How?Does the mailman go there?" I asked.

"No, but I have an idea. " Mom drove to a party store and returned with a red balloon. I asked her what it was for.