Playing is serious business for children．In fact, it's what they do best! Ask them why they do it, and kids will probably say, "Because it's fun!" But it's much more than that．It's also good for them．

    Studies show that from birth babies begin learning through playing．They use their five senses to get to know their new world．Touching allows them to discover how different things feel．Brightly coloured toys and clothing help develop a baby's sense of sight (视觉)．When small children choose which toy to play with, they begin developing their abilities in making decisions．

    Children love toys that allow them to use their imagination (想象力)．Sometimes an empty box is more fun than a high-tech (高科技) toy．That's because a box can become anything to a child．

    Crayons, paints and Play-Doh (彩色塑泥) are also good because they allow children to create．Traditional building blocks teach important pre-maths skills．

Playing doesn't become any less important once children start school．Many valuable lessons about life are learned on the school playground．Kids learn how to share, take turns and play by the rules．

    Hello! I'm Barbara Green. I'm a girl. Look! I'm from America. I live at 225 King Street, Washington. (华盛顿) My telephone number is 474-8980. My e-mail address (电子邮箱地址） is barbaragreen@sina.com. Do you like to give a call or send an e-mail to me? I'd like to be your friend.

    One day, you open the fridge and find some moldy(发霉的) food. But before you can throw it away, your mother stops you. She doesn't want to waste food. She cuts off the moldy pan and eats the rest. Is it safe to do this?

    Mold(霉菌) can grow on almost all kinds of food. Mold is usually green, white, black or gray.

    Mold makes food ®oft and changes it's color. Moldy food tastes quite bad—and it's not safe to eat.

    If you find mold in soft food, just throw it away. Bread, tomatoes and hot dogs are soft food. This kind of food allows mold to easily grow below its surface.

    But it's easy to remove mold from hard food. The mold can't grow very deeply inside this kind of food. According to the BBC, you should cut about 2.5 cm around and below the mold and remove it.

    It's OK to cut the moldy parts out of hard food and eat the rest. But if the food is completely covered with mold, you should still throw it away.

    Most kinds of mold are bad for us. But some kinds of mold can be used to make food. For example, peniciliium(青霉菌) can be used to make many types of cheeses, such as blue cheese. These cheeses are safe to eat and they're quite delicious as well:

    There has been a lot of talk about Chinese bicycle sharing recently. Shared bikes are nowadays becoming the centre of attention in our We Chat friend circle. Many of our friends post photos of themselves riding bikes, especially during the weekend in natural parks, and we can see people logging in and out of shared bike apps. But are people really drawn to(被....所吸引) the idea of exercise and green transportation all of a sudden?

    Some people have tried Mobikes lately, and they don't particularly like Mobikes. They think the first generation Mobikes, the ones without baskets, are designed for athletes. They are very hard to ride, and the seat is not adjustable(可调节的). Then, they tried the yellow ofo bikes. They are easier to ride than Mobikes, but they don't usually have baskets, and you need to enter the password by hand, instead of scanning a QR code and having the lock open automatically like with Mobikes.

    We appreciate that there are shared bikes on the roads. They have saved us a lot of time during emergency situations. And on beautiful, clear days, we do enjoy riding them outside the city. But from what we've seen in our friend circles, people have been giving them endless praises, while we still saw some obvious flaws (缺陷).

    In our experience, there has never been a unanimous(一致的) decision on anything in public opinion. It makes us wonder whether these people really like riding shared bikes or are just saying this to agree with others. When we asked them individually, a friend of us, Lisa, secretly told us she tried the bikes to fit in(融入朋友圈). She doesn't like bikes and finds city's roads too harsh for bike riding. But the only way to hang out with her friends was riding out of town together. To join in social activities, she had to pick up bike riding again. Another young man, Simon admitted that he started talking about and forwarding information(转发信息) on shared bikes to appear cool and fashionable to friends. He started paying attention when Mobikes firs launched(推出). These views will give us something new to think about when we ride these bikes again.

With only one yuan, could you live in a city for one day? It may sound impossible.{#blank#}1{#/blank#}

On April 10th, more than 60 students from a middle school took part in the One Yuan Metropolis Survival(一元城市生存). A charity organization(慈善组织) for teenagers held this activity.{#blank#}2{#/blank#} And it is going to four others, including Beijing.

In the activity, students had to live and deal with difficult tasks. To make money, many students looked for part-time jobs and saw how hard life was. A 14-year-old girl asked more than 10 restaurants for a job and finally got one. "{#blank#}3{#/blank#} But gradually, we got used to it," she said. After being a waiter for an hour, she got 25 yuan.

Living was hard, but finishing the tasks wasn't any easier. The students went to different places to finish tasks in a short time. The most amazing one was when they had to exchange things worth a thousand yuan with only a piece of paper in half an hour. "{#blank#}4{#/blank#} From a balloon to a cake to a bottle of yogurt...after almost 20 tries, we got an expensive ring," a student said. "We will give all of the money we have raised to poor schools in Tibet."