第7题: [单项选择]In what way does lens design resemble chess A. In the number of steps each takes towards the goal. B. In the designs of the two activities. C. The steps to the goals and the goal itself are known. D. Each has a doer and a competitor. 参考答案:C 答案解析:这句话的意思为:达到目标步骤和目标本身都是已知的。第一段指出,设计透镜就像布棋局,下棋时,下棋者用一系列的步骤将死对手(trap his opponent's king):设计透镜时设计者通过使物体放