一 根据课本 P48-P49 的故事，选择合适的单词，补全短文。
carry services buy paper difficult
Long ago, people didn't have money. They exchanged goods or 1. . For example, a farmer could exchange three chickens for a pair of shoes. But sometimes it was 2. to get the things they wanted.
Later, people used different forms of money, like shell money, knife money and copper coins. But metal coins were heavy and not easy to 3. . So people used 4. money.
We still use paper money today. And we have bankbooks and cards. We can also use our mobile phones to pay. Money has changed a lot, but its job is still the same: to help us 5. and sell.

1. services
2. difficult
3. carry
4. paper
5. buy

【分析】先通读短文，理解短文讲述货币发展的故事，再结合给定的5个单词（carry、services、buy、paper、difficult），根据每个空的上下文语境匹配合适的单词填空。具体思路：1. 第一空对应“交换商品或______”，需找与goods并列的名词；2. 第二空对应物物交换的不便，需填表困难的形容词；3. 第三空对应金属硬币的缺点，需填表携带的动词；4. 第四空结合后文“paper money”，需填表纸的名词；5. 第五空与“sell”对应，需填表购买的动词。
【解析】1. 第一空：“goods or services”是常用搭配，意为“商品或服务”，符合语境，故填services；2. 第二空：物物交换时难以换到想要的东西，difficult（困难的）符合语境，故填difficult；3. 第三空：金属硬币重，不容易携带，carry（携带）符合，故填carry；4. 第四空：后文提到“paper money”，此处指使用纸币，故填paper；5. 第五空：与“sell（卖）”对应，buy（买）符合逻辑，故填buy。
【答案】1. services 2. difficult 3. carry 4. paper 5. buy
【知识点】词汇运用、短文填空
【点评】本题结合货币发展的故事语境，考查常用词汇在语境中的运用，需学生理解上下文逻辑匹配单词，难度适中，是基础的词汇类题目。
【难度系数】0.6