第6部分：完形填空(第51～65题，每题1分，共15分)
阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上。
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. ith no difference beteen his products and the products___________ (51) his competitors, he ill sell nothing if he charges above the market price and he ill sell all if he charges at or___________(52) the market price. Hoever, in considering the price, he must take the___________(53) of production into consideration. There are times hen he may be illing to sell belo his cost. This might happen hen prices tumble for___________(54) he believes ill be a short time. Hoever, no business person can ___________(55) to lose money for a prolonged period. He must be constantly ___________(56) 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 as production increases, costs per unit decrease. ___________(57) mass production has made this true in certain industries and at certain levels of production, ___________(58) logic and practical experiences have shon that costs per unit begin to rise beyond a certain level of production. Some economists___________(59) to this principle as the la of increasing costs.
The reason costs rise as production goes up is ___________(60). Hoever, it is easy to recognize that as production goes up, the need for additional factors of production ill also gro, ___________ (61) competitive bidding in the marketplace for the factors of production. If a producer needs ___________(62) skilled labor to produce more, and none of this labor is unemployed, the producer ill have to get___________ (63) from other sources. This can be done by___________(64) higher ages. Higher bidding ould also apply to the other factors of production. e must also recognize that not all labor is equally productive, ___________(65) not all land is equally fertile and not all ore (矿石) is equally rich in the mineral anted.
51 A to B at C of D on医,学全,在线.搜集.整理www.lindalemus.com
52 A belo B beneath C over D above
53 A price B cost C orth D profit
54 A that B hy C hat D if
55 A afford B pretend C offer D decide
56 A sure B afraid C aare D suspicious
57 A Because B since C hen D hile
58 A both B neither C none D any
59 A resort B refer C turn D attend
60 A clear B simple C difficult D complex
61 A bringing B resulting in C including D carrying out
62 A less B numerous C more D many
63 A them B these C it D those医学全在线,搜集整,理www.lindalemus.com
64 A offering B cutting C reducing D having
65 A as if B just as C because D while
