概括大意与完成句子

The most sophisticated （先进的） Japanese robots, which have vision systems and work at very high speeds, are still based on American designs. Studies of robots, particularly computer control software, are considered to be generally less advanced in Japan than in America or Europe.

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Even the most sophisticated Japanese robots are__________.

A、free of charge

B、based on American designs

C、too costly

D、not reliable

【正确答案】 B

【答案解析】 从第一句话可以看出答案应该是选择B。

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