I was never very neat while my roommate Kate was extremely organized. Each of her objects had its place, but my always hid somewhere. She even labeled (贴标签) everything. I always looked for everything. Overtime, Kate got neater and I got my merriser. She moved to push my dirty clothing over and I would lay my books on her tidy desk. We both got tired of each other.

Who broke out one evening. Kate came into the room. Soon, I heard her screaming, “Take your shoes away! why under my bed!” Suddenly I saw my shoes flying at me. I jumped to my feet and started yelling. She yelled back louder.

The room was filled with anger. We could not have stayed together for a single minute but for a phone call. Kate answered it. From her end of the conversation, I could tell right away her grandma was seriously ill. When she hung up. She quickly crawled (爬) under her covers, crying. Obviously. that was something she could not go through alone. All of a sudden, a warm feeling of sympathy (同情) rose up in my heart.

Slowly, I collected the pencils, took back the books, made my bad. Cleaned the suckers and swept the floor even on her side. I got so absorbed into my work that I even didn’t notice Kate had sat up. She was watching. Her tears dried and her expression was such disbelief. Then, she reached out her hands to grasp mine. I looked up into her eyes. She smiled at me. “Thanks.”

Kate and I stayed roommates for the rest of the year. We didn’t always agree, but we learned the key to living together: giving in, cleaning up and holding on.

As Artificial Intelligence （AI） becomes increasingly sophisticated （先进的，尖端的）, there are growing concerns that robots could become a threat （威胁）． This danger can be avoided, according to computer science professor Stuart Russell, if we figure out how to turn human values into a programmable code.

Russell argues that as robots take on more complicated tasks, it's necessary to translate our morals （道德） into AI language.

For example, if a robot does chores around the house, you wouldn't want it to put the pet cat in the oven to make dinner for the hungry children． "You would want that robot preloaded with a good set of values," said Russell.

Some robots are already programmed with basic human values. For example, mobile robots have been programmed to keep a comfortable distance from humans. Obviously there are cultural differences, but if you were talking to another person and they came up close in your personal space, you wouldn't think that's the kind of thing a properly brought-up person would do.

It will be possible to create more sophisticated moral machines, if only we can find a way to set out human values as clear rules.

Robots could also learn values from drawing patterns from large sets of data on human behavior. They are dangerous only if programmers are careless.

The biggest concern with robots going against human values is that human beings fail to do sufficient testing and they've produced a system that will break some kind of taboo（禁忌）.

One simple check would be to program a robot to check the correct course of action with a human when faced with an unusual situation.

If the robot is unsure whether an animal is suitable for the microwave, it has the opportunity to stop, send out beeps （嘟嘟声）, and ask for directions from a human. If we humans aren't quite sure about a decision, we go and ask somebody else.

The most difficult step in programming values will be deciding exactly what we believe is moral, and how to create a set of ethical （道德伦理的） rules． But if we come up with an answer, robots could be good for humanity.

3:00 pm It’s Friday. Alice comes home from high school to her mother who greets her at the door. She puts her backpack on her bedroom floor. She sees that she got a text from her friend, and hurriedly texts back before getting a head start on her homework.

4:15 pmAlice takes a moon cake from the kitchen that her mother has set aside for her. Her mother sits her down in the dining room to ask about Alice’s day. Alice tells her mother in Chinese about her math test that morning. She fails to tell her about her history class on women’s rights and her modern art class, because she knows it would make her mother uncomfortable.

6:30 pm Alice tells her mother in rapid Chinese that she’s done her homework and mentions that there is a mandatory(强制的) school function that night which she will have to attend. She asks her if she can go over to a friend’s house to study in the meantime. Her mother refuses because she has arranged for a tutor to come over.

7:00 pm Alice puts on a long-sleeved shirt and jeans, because she knows her mother would approve, but secretly packs a crop top(露脐装) and shorts. She empties her backpack of books and puts in her change of clothes.

7:45 pm Alice’s mother drives her to the school and drops her off. She tells Alice that she’ll pick her up when the function is over. The girl tells her mother that she will call.

8:00 pm Alice finds her friend. She changes to English and tells her that she’ll be right back. She goes into the bathroom and changes into the clothes that she brought. She now looks like all the other kids at the dance. She deeply loves her mother and hates lying to her, but she knows that is the only way she’ll understand. Avoiding the issue entirely by just “slipping out” is the only way she feels she can maintain her loving relationship at home, but still fit in with her schoolmates, who are themselves doing something that is supported by their parents.

In today’s world, scenarios (情况) like this one are more than frequent. They’re everywhere. Being born or living in a different country than the country your parents grew up in has become more and more regular. In the U.S. where the word “immigration” (移民) is often on people’s lips, nearly one-quarter of the 70.9 million children and adolescents under 17 in 2009 had at least one immigrant parent. The untold story of immigration is the stress put on the adolescents who need to live in two different worlds at the same time.

In the home, these teenagers are brought up within the traditional culture of their parents. They eat sushi, andxiao long bao, but even more than that, they’re brought up with the ideas and values of their parents’ cultures. Even the most independent teenager is influenced by his or her parents. However, as soon as these teenagers leave their houses, these values and expectations begin to lose their meaning. Instead of it being something that unites them with others, these traditional principles create cultural boundaries between teenagers. Seeing this and desperately wanting to connect with others, teenagers cast off(抛弃)their identities and roles in the home and put on a new culture and set of values.

These teenagers change themselves many times a day to adapt to these different worlds. Of course this isn’t something that they necessarily have to do. But following what their parents want and what their friends expect gives them the ability to feel accepted both in their home and in their school. In most cases, these teenagers are not pretending to be something they’re not. Rather, they are simply willing to play double roles in the drama of their life, adding an extra layer of stress to their teenage years.

Many facts suggest that children are overweight and the situation is getting worse, according to the doctors.     16    .

Some people blame the fact that we are surrounded by shops selling unhealthy, fatty foods, such as fried chicken and ice cream at low prices.     17    , then probably children would buy less take-away food.

    18    . I agree with this, because good eating habits begin early in life, long before children start to visit fast food shops. If parents often give their children fried chicken and chocolate rather than healthy food, they will go for sweet and salty foods, and children will find it hard to get rid of the habit.

There is a third reason for this situation. Children these days take very little exercise. They do not walk to school. When they get home, they sit in front of the television or their computers and play computer games.     19    . What they need is to go outside and play active games or sports.

The above are the main reasons for this problem.     20    , as well as forcing them away from fast food shops and bad eating habits.