input question: Write a multi-choice question for the following article, with the given choices and answer: Article: In cities with rent control, the city government sets the maximum rent that a landlord can charge for an apartment. Supporters of rent control argue that it protects people who are living in apartment. Their rent cannot increase; therefore, they are not in danger of losing their homes. However, the critics say that after a long time, rent control may have negative effects. Landlords know that they cannot increase their profits. Therefore, they invest in other businesses where they can increase their profits. They do not invest in new buildings which would also be rent-controlled. As a result, new apartments are not built. Many people who need apartments cannot find any. According to the critics, the end result of rent control is a shortage of apartments in the city. Some experts argue that the minimum wage law can cause problems in the same way. The federal government sets the minimum that an employer must pay workers. The minimum helps people who generally look for unskilled, low-paying jobs. However, if the minimum is high, employers may hire fewer workers. They will replace workers with machinery. Therefore, other things being equal, the number of workers that employers want decreases. Thus, critics hold the opinion that an increase in the minimum wage may cause unemployment. Some poor people may find themselves without jobs instead of with jobs at the minimum wage. Supporters of the minimum wage say that it helps people keep their dignity. Because of the law, workers cannot sell their services for less than the minimum. Furthermore, employers cannot force workers to accept jobs at unfair wages. Economic theory predicts the results of economic decision, such as decisions about farm production, rent control, and the minimum wage. The predictions may be corrected only if "other things are equal". Economists do not agree on some of the predictions. They also do not agree on the value of different decisions. Some economists support a particular decision while others criticize it. Economists do agree,... Options: A cause a shortage of apartments B worry those who rent apartments as homes. C increase the profits of landlords. D encourage landlords to invest in building apartments. Answer: A cause a shortage of apartments Question:???
output answer: There is the possibility that setting maximum rent may _ .

input question: Write a multi-choice question for the following article, with the given choices and answer: Article: Most people think of racing when they see greyhounds and believe they need lots of exercise. They can actually be quite lazy! Greyhounds are good at fast races but not long-distance running. They do need regular exercise but they like to run for a short burst and then get back on the bed or a comfortable seat. Another misunderstanding is that greyhounds must be aggressive because they are big in size. In fact greyhounds love people and are gentle with children. Greyhounds can live for 12 - 14 years but usually only race for two or three years, and after that they make great pets. They don't need a lot of space, don't make a lot of noise, and don't eat a lot for their size. Normally, greyhounds can be as tall as 90 cm. There is, however, a small-sized greyhound, which stands only 33 cm. Greyhounds come in a variety of colors. Grey and yellowish-brown are the most common. Others include black, white, blue, red and brown or a mix of these. Greyhounds have smooth body coats, low body fat and are very healthy. Because they're slim they don't have the leg problems like other dogs the same height . But they do feel the cold, especially since they would much rather be at home in bed than walking around outside. Options: A to tell people how to raise greyhounds B to let people know more about greyhounds C to explain why greyhounds are aggressive D to describe greyhounds of different colors Answer: B to let people know more about greyhounds Question:???
output answer: The text is written mainly _ .

input question: Write a multi-choice question for the following article, with the given choices and answer: Article: Are you bored and lonely? Do you want to make new friends? Do long working hours make it difficult for you to get out and about to meet new people? Maybe you or your friends have moved to a new area and this has left you feeling lonely. Even if you are already the proverbial social butterfly, you may still find that your existing friends do not share the same interests and feelings. You may have a satisfying social life, but you still find you have no one to travel with. You may have your circle of friends, but find that none of them will join you in the activities or sports that interest you most. These are just a few of the reasons why millions of people search online to find new friends. Matchmaking websites are good tools to make friends online. Profile matching technologies enable you to search for new friends by age, gender, location, interests and much more. You can make friends near you or anywhere in the world and learn about new countries, cultures and lifestyles. Making friends online is easy and anonymous as members get to know you by your username only. You can get in touch with members by sending private messages, joining in discussion forums, or sharing online chat. When you are ready, you can take your new friendships into the real world by arranging meetings to share your common interests. If you prefer to meet in numbers, you can join or create your own local group in which members share interests and activities near you. Options: A introduce a new way to make friends B warn people not to trust online friends C tell readers how to lead a good social life D explain why people like to make friends online Answer: A introduce a new way to make friends Question:???
output answer: The purpose of this passage is to _ .

input question: Write a multi-choice question for the following article, with the given choices and answer: Article: Now, we know that if we do not get enough vitamins, we are at risk of developing a number of diseases. As a result, vitamin supplements ,though expensive, are popular with people who worry that they are not getting enough vitamins from the foods they eat. But contrary to what many people think, medical experts have found little evidence that most supplements do anything to improve health or protect against disease. In fact, medical experts warn that taking too many of some vitamins can be harmful. For example, too much vitamin E can cause bleeding. People should discuss what vitamins they take with their doctors, as some vitamins can produce harmful side effects when mixed with medicines. Experts, however, do say that sometimes vitamins can help prevent disease. People who know they lack a particular vitamin should take vitamin supplements. Some older adults, for example, may not have enough vitamin B-twelve. This is because, as people get older, their body loses its ability to take it from foods. Also, people who spend much time inside may need some extra vitamin D as the skin makes this vitamin from sunlight. 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 color1ed 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. Options: A sweet potatoes B green leafy vegetables C pork products D eggs Answer: B green leafy vegetables Question:???
output answer:
For people who lack Vitamin B-twelve, they can eat more from _ .