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You___ worry about your son. He will get well soon.

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At present, people use money every day. It is very important in our life.1.

Long ago, people didn¡¯t need money. 2. As time passed, people learned to raise home animals and plant crops(ׯ¼Ú). Sometimes, families produced more than they needed, so they started to trade with other families. Later, people began to use money as a way of exchange(½»»»). 3. They used shells, salt and large stones.

During the 7th century B£®C.(¹«ÔªÇ°), people began using coins as money. They were easier to carry. 4.

The Chinese were the first to use paper money, as early as the 11th century. The Italian traveler Marco Polo saw the Chinese using money when he visited China in the 1200s.5.

Today, we have many ways to pay for things. Often, a bank card is used for paying. It is safer and quicker than using a lot of paper money. Besides, proudly, Chinese always use Internet and mobile payment, such as Alipay and WeChat.

A£®Do you know the history of money?

B£®Instead, people still use paper money.

C£®They were similar to the money at present.

D£®Later, countries began to make their own coins.

E£®However, it was not the kind of money we use today.

F£®They lived on wild animals, fruits and other plants.

G£®European countries started using paper money in the 1600s.

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Natural resources are things that we use that come from Earth. Out natural resources are limited(ÓÐÏÞµÄ). This means that they will not________ forever.

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Everyone can make contributions to protecting natural resources.

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3.A. station B. building C. ground

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7.A. distance B. space C. place

8.A. alive B. alone C. awake

9.A. with B. for C. by

10.A. surprising B. funny C. wise

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