Different vitamins are found in different foods. Vitamin A is found in fish liver oil. It also is in the yellow part of eggs. Sweet potatoes, carrots and other darkly colored fruits and vegetables contain substances that the body can change into vitamin A. Vitamin B-twelve is found in green leafy vegetables and other foods, like fruits. Vitamin K can be found in pork products.

　　In fact, for most people, a balanced diet can ensure enough of the vitamins our bodies need. So, it is important for us to eat a mixture of foods every day to ensure that we get enough vitamins our bodies need.

　　4. What is probably talked about before this passage?

　　A. How many vitamins a person’s body needs.

　　B. How many vitamins some foods contain.

　　C. The benefits that vitamins bring to our health.

　　D. What people should do to stay healthy.

　　5. Vitamin supplements are popular with people because ________.

　　A. people mistakenly think that they are good for their health

　　B. they contain more vitamins than the foods people eat

　　C. food does not provide enough vitamins people need

　　D. people fear that a lack of vitamins will lead to disease

　　6. From the passage, we can learn that medical experts advise people _________.

　　A. never to take any vitamin supplements

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