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Building blocks(积木) are still one of the most popular traditional toys today．Their interesting design and easy use attract children of all ages．Most traditional toys, like building blocks, were first made of wood．Today, wooden building blocks are still used, but now there are several other types of building blocks to choose from, like plastic building blocks．
①Children build all kinds of things that they see in everyday life _________ building blocks． This gives them the ________ to learn new things and life skills．
②Building blocks can help children to practice their language skills ． Most children talk to each other as they build things with these traditional toys． This type of toy also helps develop the skills that children need in life． As they begin to join groups playing with building blocks, they learn to take turns, to share, and to solve problems with others． However, these are not the only advantages of playing with building blocks． The building blocks also help develop children's skills in math and science． They allow children to work according to the steps of scientific discovery, which are first to watch and think, and then to test． Traditional toy building blocks also come in different shapes, colors and sizes． These types of building blocks encourage children to develop skills in dividing things． Playing with building blocks is not just fun but also very helpful． So people around the world like them．
回答下列问题：What were traditional toy building blocks made of?
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It is both fun and helpful to play with building blocks.
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B

    Many years ago, there was a very popular sport in America. Who invented the sport more than 3,000 years ago? We don't know. But everyone thinks it was the Olmecs(奥梅克人）made it popular.

    People don't have the same rules about the game all over the world. People in different parts of the world play the game in different places at different times. If we want to bring back the sport, we need to have two teams of players standing on each end of a court. When the game begins, the two teams need to pass a ball from one side of the court to the other. The players can't touch(触) the ball with their hands and feet. But they can use their elbows(肘) and other parts of their bodies hit it. If a player does not pick up the ball in time and lets it fall to the ground, that team loses a point. But if a player makes the ball through a hoop(环),that team scores a point. The team with the most points wins the game.

    Coloring is an activity that children worldwide have long enjoyed. With a picture already made for them, kids simply chose a crayon, pencil or marker of their favorite color and fill it in. Today, it also becomes more and more popular among teenagers and even adults, who are enjoying relaxing hours of coloring. In December, five of the top ten best-selling books in the United States were coloring books.

    They are fun, but are coloring books good for you?

    The good feedback(反馈)from customers is encouraging. Trina Lucida, a popular artist creating coloring books, says that many of her customers are buying the coloring books for others who are sick or going through a hard time. She adds that the "big idea" behind her latest book is to encourage people to do something creative.

    Lucida is right, according to Allan Rohan, a psychology(心理学)professor. "Many customers think of coloring books as a new creative stage," he said in an interview, "but what's more important is that people spend time coloring in order to reduce stress after a long day." Research shows that coloring can reduce stress by guiding people to focus on(专注)one simple task. When a person is filling in a flower with a light purple color, he focuses on the flower and forgets about all his troubles in life.

    Experts add that coloring may relieve a certain kind of pain. Doing the coloring helps people relax their mind and calm down. Also, coloring helps people's brain in a healthy way. The shape of the drawing makes one side of the brain active, while the color of the drawing improves the other. Coloring can bring out your imagination and take you back to your childhood. Interesting, isn't it?

    "It's very relaxing," said Susan Jackson, a big fan of Lucida's coloring books. "Coloring frees my mind. And it's not just to try to fill blank(空白的)pages. The pictures make me happy and there is just something about them. So I'm saving the pictures I like best to the very end."

Why salmon will newer get lost

    When you're packing for an adventure, what's the most important thing you'll need? If you don't want to get lost, you' need a map. Or better yet, a GPS. What about other animals? How do they know where they're going?

    While humans depend on technology to travel, some animals have something far more advanced. Researchers, mainly from Oregon State University, US, found that Chinook salmon have a "built in GPS" of the Earth's magnetic field(磁场). This means as soon as they are born they are able to direct themselves in the ocean. It acts like a big map inside their brain.

    Scientists placed some baby salmon into a big swimming pool. To simulate the Earth's magnetic field, they put magnetic coils(线圈) all around the pool. Then, by changing the direction of the coils, the salmon began to change their own direction. They started to face in the direction of their ocean feeding area. This is a safe place in the ocean where salmon can find food to eat. When the scientists changed the coils to the opposite side, the salmon also turned in the opposite direction. Just by using their "built-in GPS", the salmon were able to figure out the direction of their feeding area.

    How did Chinook salmon get their "built in GPS"? The scientists believe that their navigation(导航) skills came through evolution(进化). The fish that were able to reach the feeding area lived longer. Then they could pass on their navigation skills to their babies. So if you're ever lost and in need of some help, maybe you should ask a salmon to point you in the right direction!