下列国家中，属于发达国家的是（     ）

    Food is very important. Everyone needs to____  well if he or she wants to have a strong body(身体). Our brains (大脑) also need a kind of food. This kind of food is ____ . We begin to get knowledge (知识) When we are very young. Small children are interested in everything around them. They learn ____  while (当) they are watching and ____ . When they are getting older, they begin to ____  storybooks, anything they like. When they find something new, they like to ask questions and ____  to find out the answer.
What is the best ____  to get knowledge? If we ____  by ourselves, we’ll get the most knowledge. If we're ____  getting answers from others and do not ask why, we will never learn well. When we study in a right way, we will learn ____  and understand (理解) better.

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