第22题: [单项选择]Which can be cited as an example of the use of money in exchange for services A. To sell a bicycle for $ 20. B. To get some money for old books at a garage sale. C. To buy things you need or want. D. To get paid for your work. 参考答案:D 答案解析:根据第一段第一句To day anyone will accept money in exchange for goods and services.可知货币可以用来交换商品和劳务,又根据该段最后一句
第23题: [单项选择]以下哪项不是操纵系统的基本要求?() A. 有必要的连锁装置 B. 有必要的监视仪表和安全保护与报警装置 C. 能迅速执行备车动作 D. 操作、调节方便,维护简单 参考答案:C