解析:推理判断题。根据文中的"Then last night as we slept in the farmer's bed, the angel of death came for his wife. I asked God if the angel of death could take the cow instead. "可知, 让农夫的奶牛死了是为了救农夫的妻子。

3. The story tries to tell the reader that 　　　.

A. the young should always learn from the old

B. angels are always ready to help the poor

C. angels are always ready to help the rich

D. sometimes things are not what they seem

答案:D

解析:推理判断题。根据本文对故事的介绍以及文中多次出现的"Things aren't always what they seem. "可知答案。

　　Most of us would like to have glowing skin, especially as we get older. 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.

　　Dr. Ian Stephen said, "Most people think that the best way to improve their skin color is to get a suntan(棕褐色). But our research shows that eating lots of fruit and vegetables is actually more effective. "

　　The team first assessed the skin color of people in relation to their diet. Those who ate more fruit and vegetables a day were found to have a more golden, yellow skin color. Those with a healthy glow had a higher presence of carotenoids(类胡萝卜素), which play a role in the immune system. Carotenoids are commonly found in fruit and vegetables such as yellow and red peppers, spinach, apricots and melons.

　　The team then studied the relation between skin tone and attractiveness. They used specialist software to operate the skin color on the images of 51 faces to simulate(模拟)more or less carotenoids and suntans. Participants were then asked to adjust the skin color to make the faces look as healthy as possible. Given the choice between skin color enhanced by suntans and skin color enhanced by carotenoids, people preferred the carotenoids skin color.

　　The study shows that not only do people use skin color to judge how healthy other individuals are, but they are accurate when they make those judgments. While this study focus on Caucasian(白种人的)faces, it suggests this phenomenon may exist across cultures, since similar preferences for skin yellowness are found in an African population.

4. Which statement is TRUE according to the text?

A. Carotenoids are important in the immune system.

B. Carotenoids are only found in the fruit.

C. Carotenoids can be improved by catching sun rays.

D. Carotenoids are the only factor that affects the skin color.