单选题 The market is a concept. If you are growing tomatoes in your backyard for sale you are producing for the market. You might sell some to your neighbor and some to the manager of the local supermarket. But in either case, you are producing for the market. Your efforts are being directed by the market. If people stop buying tomatoes, you will stop producing them. If you take care of a sick person to earn money, you are producing for the market. If your father is a steelworker or a taxi driver or a doctor or a grocer, he is producing goods or service for the market. When you spend your income, you are buying things from the market. You may spend money in stores, supermarkets and gas stations. Still you are buying from the market. When the local grocer hires you to drive the delivery truck, he is buying your labor in the labor market. The market may seem to be something abstract. But for each person or businessman who is making and selling something, it is concrete. If nobody buys your tomatoes, it won't be long before you get the message. The market is telling you something. It' s telling you that you are using energies and resources in doing something the market doesn' t want you to do.

单选题 Which of the following would be the best title for the passage?

【正确答案】 B

【答案解析】解析：主旨大意题。通读全文可知，文章第一句“The market is a concept．”及下文买和卖的具体事例诠释了“市场”这个概念。由此可知，本文主要讲了“什么是市场”这一问题，所以选项B为正确答案。

单选题 All of the following acts are producing for the market EXCEPT______.

【正确答案】 C

【答案解析】解析：事实细节题。根据第三段第一句“When you spend your income，you are buying things from the market．”可知，选项C(上夜校读书)是花钱，相当于从市场上买东西，而不是producing for the market(为市场生产东西)，所以选项C为正确答案。

单选题 You axe buying from the market when you______.

【正确答案】 D

【答案解析】解析：事实细节题。根据第三段第一句“When you spend your income，you are buying things from the market．”可知，花钱是在从市场上买东西，选项D“在餐厅招待朋友”是需要花钱的，所以选D。

单选题 The word "concrete" in the last paragraph may most probably mean______.

【正确答案】 C

【答案解析】解析：词语理解题。根据最后一段第一、二句“The market may seem to be something abstract．But for each person or businessman who is making and selling something，it is concrete．”可知，but之后的句子与前面的句子“市场可能是抽象的”是转折关系，所以后面的句子表达的意思是“但是对于每一个生产和销售东西的人来说，市场是真实的，是具体的”。由此可知，concrete意为“实在的，具体的，有形的”，和real意思相近。