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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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将②处翻译成汉语________________________________________________________________
找出文中与下列句子意思相近的句子：    
It is both fun and helpful to play with building blocks.
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在文中找出最能表达该短文主题的句子：
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