In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Article: For all the dinner table, a glass of milk seems to be a constant, at least it was when I was growing up. It was widely believed that milk was integral in building strong bones and teeth. There's no doubt that dairy products , and milk in particular, are high in protein and calcium, and most milk products are supplemented with Vitamin D and A. While it's well known that our bones need calcium, some studies suggest that high calcium intake doesn't necessarily lower a person's risk for fractures . A Harvard study found that people who drank two or more glasses of milk had no greater protection from breaking a bone than those who drank a glass or less a week. There's no doubt that we need calcium. Some anti-dairy supporters claim that dairy can lead to heart disease. Much of this claim is based on high fat and high dairy products, like cheeses and creams, which may indeed contribute to cardiovascular problems. Some studies have linked high milk intakes with a risk of prostate cancer; this seems to be caused by high-fat dairy products, not dairy in general. Although milk was always regarded as one of the most important thing we need for our bones, yet least promoted, factors involved in strengthening bones. Perhaps we should think of dairy as less like a nutrient and more like a food. If you like it, eat it. If not, find _ . Because some claims may not be completely true, when I eat a cream, I'm not thinking about calcium, protein, or any such thing I'm thinking delicious.
Answer: There is no link between them.
Which of the following is TRUE on the milk?

Article: A couple had a son eleven years after they married. They were a loving couple and the boy was _ . When the boy was around four years old, one day the father was very tired after work so he asked his wife to pick up their son. The mother, who was very busy in the kitchen, totally forgot about it. Later the boy lost his way on the street. When the son was found missing, the mother hurried to look for him, but she didn't find him. The mother felt very sad and didn't know how to face her husband. When the father went to the police station after hearing that the son was missing, he looked at his wife and said just four words. What do you think the four words were? The husband just said "I love you, darling." www.zxxk.com The son was missing. If she had picked him up earlier, this would not have happened. There is no point in blaming anyone. His wife had also lost her only child. What his wife needed at that moment was comfort and understanding from her husband. That is what the husband gave his wife. Several weeks later, with the help of the police, the couple finally found their lost son. The family's relationship became stronger over that time. Sometimes we spend lots of time asking who is to blame. We miss many chances to give each other support and let each other feel the warmth of human relationships. Get rid of all your unwillingness to forgive, selfishness, and fears and you will find the world is much more wonderful.
Answer: He was too tired to do it.
Why didn't the father pick the boy up himself?

Article: College libraries are designed primarily for research and study. To explain its use, let us choose a research topic and follow the step-by-step procedure of looking up the material for the paper. Suppose your assignment is to write a paper on a novel called The Sun Also Rises by American writer Hemingway.The first step is to go to the main catalog.Many small drawers on the large wooden cabinets are lined up in alphabetical order.Each of the drawers contains hundreds of alphabetical ordered cards.These cards are printed references to all material available in the library.Title cards are cataloged by the first word of the book title, leaving out the articles like "a", "an" and "the".And then you get the cards for the books you need.On the upper left corner of each card is the call number.This is the numerical code that shows where the book is located in the library.The library has open and closed stacks.If your book is on the open stacks, you can go to the open-stack room, and according to the call number find it out by yourself.There are only about 30,000 books on open stacks, while most of the 800,000 books in our library are kept in closed stacks, which are accessible only to teachers and graduate students. For undergraduates like you, borrowing books from the closed stacks have to be done with the help of our librarian.In that case, you must fill out a call slip for the book, showing the call number, author and title.You can get call slips on tables near the catalog cabinets.You show your call slip together with your library card to a librarian at the information desk.He or she will help you find the book out in the closed stacks.
Answer: To guide readers how to find books needed in a college library.
What is the main purpose of this text?