Read the article below about cost. Choose the best word to fill each gap, from A, B, C or D. For each question 19—33, mark one l

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问题 Read the article below about cost.
Choose the best word to fill each gap, from A, B, C or D.
For each question 19—33, mark one letter (A, B, C or D) on your Answer Sheet.
There is an example at the beginning.
                         Cost as a Factor in Supply
In a purely competitive market, the supplier of goods and services has no control over the market price, because he produces too little to influence market conditions With no difference between his product and the products (19)…his competitors, he will sell nothing if he charges above the market price and he will sell all if he charges at or below the market price. However, in considering the price, he must take cost of production (20)… There are times when he may be willing to sell below his cost. This might happen when prices tumble for (21)… a short time. However, no business person can (22)…lose money for a prolonged(延长的)period. He must (23)…of his costs in relation to the market price if he is to compete successfully and earn a profit.
Many people have the impression that (24)…production increases, costs per unit decrease. (25)…mass production has made this true in certain industries and at certain levels of production, (26)…logic and practical experience have shown that costs per unit begin to rise beyond a certain level of production. Some economists (27)…this principle as the law of increasing costs.
The reason why (28)…rise as production goes up is complex. However, it is easy to recognize that as production goes up, the need for additional factors of production will also grow, resulting (29)…competitive bidding(出价)in the marketplace for the factors of production. If a producer needs (30)…skilled labour to produce more, and none of this labour is unemployed, the producer will have to get (31)…from other sources. This can be done by (32)…higher wages. Higher bidding would also apply to the other factors of production. We must also recognize that not all labour is equally productive, (33)…not all land is equally fertile(肥沃的)and not all ore is equally rich in the mineral wanted.

选项 A、Because
B、Since
C、When
D、While

答案D

解析 根据上下文,以及该句的意思,这里需要一个引导让步状语从句的连接词,while在句中起此作用时,其意与although相同。这一状语从句的意思是:虽然大规模生产已在一些行业在某种程度证实了这一点……例如:While the light turned green,the traffic couldn’t move a bit.虽然已是绿灯,车辆仍无法前行寸步。because和since引导原因状语从句,而when引导时间状语从句。
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