—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 on

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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, be 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、he believes will be
B、what he believes be
C、what he believes will be
D、he believes to be

答案C

解析 被选择项是插入成分,去掉这一成分句子在语法上仍然成立:This might happen when prices tumble for a short time.但作者强调的是,供应商这样认为,即,认为价格会在短时期内下跌。for是介词,它后面可以跟名词或名词从句,做它的宾语,不能直接跟句子,因此A和D不能选择。 what可以引导名词从句。例如:He is not interested in what you told him。他对你告诉他的事并不感兴趣。I did not do what you expected me to do.我没有做你希望我做的事。
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