The dog has always been noted for ______. [br] The dog has been of most value to

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问题 The dog has always been noted for ______. [br] The dog has been of most value to man in the development of ______.

选项 A、a treatment for rabies
B、open-heart surgery
C、a cure for distemper
D、Both A and C

答案 B

解析见第三段第三句Open-heart surgery has been made possible largely because of the dog．

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【B1】[br]【B10】A、alwaysB、hardlyC、alreadyD、everC词义辨析。already通常用在肯定句中(否定句或疑问句中