China has been the birthplace of many of the world's greatest inventions. It was, for example, the first country to produce paper money. Before the invention of paper money and coins, people used many different kinds of things for buying and selling. {#blank#}1{#/blank#} This exchange of goods and services for other goods and services is called bartering（物物交换）.

    {#blank#}2{#/blank#} In 1200 BC, people in China began to use shells as money. Usually the shells used as money were very small. This made it easier for people to carry money over long distances, and allowed for trade to develop between different parts of the country.

    In the years which followed this invention, many other countries around the world began to do the same. {#blank#}3{#/blank#}

    The next development was in 1000 BC, when China started making bronze and copper shells. It wasn't long before the Chinese made round coins out of metal. {#blank#}4{#/blank#} By 500 BC, metal coins had begun to appear in countries like Persia and Greece, and later in the Roman Empire.

    About 1000 years later, leather was used as money in China, and in 806 AD, the first paper banknotes were produced by the Chinese people. {#blank#}5{#/blank#}

A. As time went by, trade between countries increased.

B. People also began collecting foreign coins as souvenirs.

C. They also used tiny shells as money for buying and selling.

D. It was still many years before paper money appeared in Europe.

E. However, as economies developed, such exchanges became impractical.

F. During that time, for example, buying a chicken might cost several potatoes.

G. The very first coins often had holes in them so that people could tie them together.

    China has been the birthplace of many of the world's greatest inventions. It was, for example, the first country to produce paper money. Before the invention of paper money and coins, people used many different kinds of things for buying and selling. {#blank#}1{#/blank#} This exchange of goods and services for other goods and services is called bartering（物物交换）.

    {#blank#}2{#/blank#} In 1200 BC, people in China began to use shells as money. Usually the shells used as money were very small. This made it easier for people to carry money over long distances, and allowed for trade to develop between different parts of the country.

    In the years which followed this invention, many other countries around the world began to do the same. {#blank#}3{#/blank#}

    The next development was in 1000 BC, when China started making bronze and copper shells. It wasn't long before the Chinese made round coins out of metal. {#blank#}4{#/blank#} By 500 BC, metal coins had begun to appear in countries like Persia and Greece, and later in the Roman Empire.

    About 1000 years later, leather was used as money in China, and in 806 AD, the first paper banknotes were produced by the Chinese people. {#blank#}5{#/blank#}

A. As time went by, trade between countries increased.

B. People also began collecting foreign coins as souvenirs.

C. They also used tiny shells as money for buying and selling.

D. It was still many years before paper money appeared in Europe.

E. However, as economies developed, such exchanges became impractical.

F. During that time, for example, buying a chicken might cost several potatoes.

G. The very first coins often had holes in them so that people could tie them together.

已知:

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回答下列问题:

    When I was 16, I wrote a list of things I wanted to do in my lifetime. Some things were easy, some difficult and some almost 1. One of the things on the list was to do a 2.

    Two years ago I spent three months travelling with a friend and it was a great experience. One of the most 3 things we saw was Iguassu Falls. The day after we visited the waterfalls we were 4 in a hotel in Brazil, playing games when my friend 5 noticed an advertisement on the wall 6 “Skydive over Iguassu Falls today!”. I realized it was time to realize my 7. Today would be the day that we would jump out of a(n) 8.

    That afternoon we were 9 and taken to the Skydive Centre. We put on our harnesses（跳伞装备）and helmets, were given some 10 and then took off into the air. My heart started to beat very fast and I felt very 11.

    Luckily, I was 12 to an instructor so I didn't have to worry about anything; I just had to 13 myself. He asked me if I was ready to fall from the plane but 14 I had enough time to 15, we fell to the ground at 400 km an hour! After about 40 seconds of 16, the parachute opened and everything slowed down. We 17 peacefully towards the earth, leaving the 18 behind us.

    This was definitely one of the scariest but most exciting 19 of my life. I would do another skydive if I had the20. I think that everyone should do something that scares them once in a while！