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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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    Soon computers and other machines will be able to remember you by looking at your eyes! The programme works because everyone's eyes are different. So in the future you won't have to remember a number when you want to use a machine or take money out of a bank. You'll just have to look at the machine and it will be able to tell who you are.
    The eye-recognition（识别）programme is already being tested in shops and banks in the USA, Britain, Spain, Italy and Turkey. Soon, this technology will take the place of all other ways of finding out who people are.
    However, scientists are working on other systems. Machines will soon be able to know you from the shape of your face or hand or even your smell! We already have machines that can tell who you are from your voice or the mark made by your finger.
    Eye-recognition is better than other kinds because your eyes don't change as you get older, or get dirty like hands or fingers. And even twins have different eyes, so the programme can be up to 94％ correct, depending on how good the technology is. Some programmes may only be right  51％ of the time. In Britain, it was found that 91％ of people who had tried it said that they liked the idea of eye-recognition. In the future your computer will be looking at you in the eye. So smile!

    Napoga is a girl in Ghana, Africa. It is hard for her family to get clean water. Every morning, she leaves home at half past five to get clean water for her family in a village far away. It takes her six hours to get enough clean water for daily cooking and drinking. She has no time to go to school or to play with her friends. Millions of people in the world are like Napoga. They can't get enough clean water to keep healthy.

    Earth Day is on April 22. But on all the other days, we must also remember it. The water we use is the most important natural resource on the Earth. Water covers about 75% of the Earth's surface. But most of that is sea water. We can't use it for many things. Fresh water covers only less than 1% of the Earth's surface.

    You probably feel lucky that your life isn't as hard as Napoga's. But that doesn't mean you don't have to worry about water. We all face serious water problems. One of them is water pollution Lots of kinds of things from cars, factories, farms and homes make our rivers, lakes and seas dirty. Polluted water is very bad for people to drink. And dirty water is bad for fish too. Now, 34% of all kinds of fishes are dying out. Scientists say that in 30 years, more than half of the people in the world won't have enough clean water. We have to learn how to save more water for ourselves and our children.

    Robots seem very new to most people. But they have a long history. The first one was made by a Greek inventor. You may have seen robots in some films. The robots in these films are stronger, faster and more clever than people in real life. Most robots are used in factories. They are used to do many dangerous, difficult or boring jobs. Some people can't look after themselves and move around. They need dogs to help them. These dogs are called guide dogs. Scientists are making robot dogs to help them. In the future, robot dogs might take the place of these guide dogs.

    Robots are also used in American hospitals. At one hospital, a robot takes meals from the kitchen to the sick people's rooms,   it never loses its way because it has a map of the hospital in its computer system.

    In the future, robots will work in space. But robots will never take the place of human beings, though they can help us in a lot of different ways.

    The world uses about a thousand million (百万) tons of water a day. Water is a human right and everyone should have their share. Yet more than 700 million people around the world have trouble getting clean, safe water.

    Treating wastewater is a good way to provide fresh water for us. And it also helps the environment by keeping waste out of rivers and oceans. 80% of wastewater around the world is not treated at all, and it is running into oceans. But now we have got the technology to treat and reuse the wastewater.

    While 75% of our planet is covered with water, only about 2% is fresh water—that comes from rivers, lakes, ice and snow. The rest, 98% of the water, is in seas and oceans. It is too salty to drink. Then desalination businesses come in. More than 19,000 factories have been built around the world, mostly in coastal countries. They process (加工) more than 92 million tons of water every day. But the technology they use requires a lot of energy.

    Scientists are working to create a less costly technology. They want to produce 20 times more clean water and make sure everyone has enough. But for now, the world still faces each day with not having enough water for everyone.