Read the article below about monopoly. Choose the best word to fill each gap from A, B, C or D on the opposite page. For each q

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问题 Read the article below about monopoly.
Choose the best word to fill each gap from A, B, C or D on the opposite page.
For each question 21-30, mark ONE letter A, B, C or D on your Answer Sheet.
There is an example at the beginning (0).

    Monopoly is one 0 the peculiar 21 which can affect the sale and purchase of certain commodities. In some markets, there may be only one seller or a 22 of sellers working very closely together to control prices. The result of such monopolistic activity is to fix prices at a level 23 to the seller, a level which may bring him artificially high profits. Many governments dislike this procedure and have taken legal actions to 24 or halt such business activities. In the U. S. anti-trust laws operate to limit cartels and mergers, 25 in Britain the Monopolies Commission examines all special arrangements and mergers referred to them by the Board of Trade.
    This type of monopoly is not the only 26 however. There are three other forms: state, legal and natural. State monopolies are quite common nowadays, where the 27 in a particular country control industries like steel and transport or important and prestigious revises like national airlines. Legal monopolies are rather different, because the law permits certain individuals to 28 solely from their special inventions, discoveries or processes. No other person may infringe their rights in respect to 29 monopolies.
    Finally, natural monopoly 30 where a nation or individual possesses most of a particular mineral for reasons of geography and geology.
0. A. of B. in C.off D. up

选项 A、where
B、but
C、while
D、when

答案C

解析 后文中英国也采取了一些措施与前句中的美国政府一样,25空前后句为并列成分,选C项。
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