Over the years, people have used different forms(形式) of money as a way to trade or save.
Seashells
Generally, people think the first form of money was seashells. About 3,000 years ago, people in some East Asian countries like China and some countries in Africa used shells. People thought shells were a good choice because they were easy to carry, similar in size and lasted a long time.
Coins
Then, people developed skills for making metal(金属) things, and metal coins appeared(出现). Metal coins were made of bronze, iron, gold or silver. The earliest metal coins were gold coins from Lydia, which were used around 600 BCE. Coins had different shapes. For example, in ancient China, people had daobi (knife coins), fangkongqian (round coins with a square hole in the centre), etc.
Paper money
The first known paper money appeared in China during the Song Dynasty, which is called jiaozi. The paper was a promise to pay a certain amount of money. Six centuries later(in the 1600s), banks in Europe started to give out paper money. Paper money became common in almost all currencies(货币), and people still use it widely.
Digital(数字的) money
These days, people are used to paying for things electronically. Now many countries are developing digital currencies. Money is used in a new form.
()52. Which place used the earliest metal coins?
A. Lydia.
B. China.
C. Africa.
D. Europe.
()53. Why were seashells a good choice as money?
A. Because they were expensive.
B. Because they were hard to find.
C. Because they had different sizes.
D. Because they were easy to carry and lasted long.
()54. What does the underlined word "shapes" mean?
A. 颜色
B. 气味
C. 形状
D. 质地
()55. Which is the best title(标题) for the passage?
A. The use of seashells
B. Money in different forms
C. Paper money in China
D. The future of digital money

D [文章大意]本文主要介绍了货币的发展历史，从贝壳、金属硬币到纸币，再到如今的电子支付和数字货币的兴起，展示了货币形式的演变过程。
52.A [解析]细节理解题。根据第三段中的“The earliest metal coins were gold coins from Lydia, which were used around 600 BCE.”可知，吕底亚使用了最早的金属硬币。故选 A。
53.D [解析]细节理解题。根据第二段中的“People thought shells were a good choice because they were easy to carry, similar in size and lasted a long time.”可知，贝壳作为货币是好的选择，因为它们便于携带且能保存很长时间。故选 D。
54.C [解析]词义猜测题。根据第三段中的“For example, in ancient China, people had daobi ( knife coins ), fangkongqian ( round coins with a square hole in the centre ), etc.”可知，画线词下文列举的刀币和方孔钱的外形不同。由此可推知，画线词“shapes”意为“形状”。故选 C。
55.B [解析]标题归纳题。根据第一段“Over the years, people have used different forms(形式) of money as a way to trade or save.”及下文介绍的贝壳、硬币、纸币和数字货币可知，文章主要介绍了货币的不同形式。B 项符合文意。故选 B。