Directions: There are 10 questions in this part of the test. Read the passag

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问题    Directions: There are 10 questions in this part of the test. Read the passage through. Then, go back and choose one suitable word or phrase marked A, B, C, or D for each blank in the passage.
The health-care economy is filled with unusual and even unique economic relationships. One of the least understood involves the  (41) roles of producer or "provider" and purchaser or "consumer" in the typical doctor-patient relationship. In most sectors of the economy, it is the seller who attempts to attract a  (42) buyer with various inducements of price, quality, and utility, and it is the buyer who makes the  (43)  . Where circumstances permit the buyer no choice because there is effectively only one seller and the product is relatively  (44)  , government usually asserts monopoly and places the industry under price and other regulations.  (45) of these conditions prevails in most of the health-care industry.
In the health-care industry, the doctor-patient relationship is the mirror image of the ordinary relationship between producer and consumer.  (46) an individual has chosen to see a physician-and even then there may be no real choice-it is the physician who usually makes all significant  (47) decisions: whether the patient should return "next Wednesday", whether drugs should be prescribed, etc. It is a rare and sophisticated patient who will  (48) such professional decisions or raise in advance questions about price, especially when the disease is regarded as serious.
This is particularly significant in  (49) to hospital care. The physician must certify the need for hospitalization, determine what procedures will be performed and announce when the patient may be  (50)  . [br] (44)

选项 A、abundant
B、superior
C、diverse
D、essential

答案 D

解析从上下文意思分析，本题所在的从句与前一个从句共同说明政府通常实行垄断的情况。abundant意为“丰富的，充裕的”，diverse意为“多种多样的”。根据常识，当产品丰富或多种多样时，政府不可能实行垄断，因此A或C填入空格都不合常理；superior意为“优良的，优越的”，也与下文的意思不合，故选D项essential。

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