单选题
What are involved in the design of a new tool according to the passage?
A、
Electronic instruments and a regular tool.
B、
A human" guinea pig" and regular tool.
C、
Electronic instruments and a human" guinea pig".
D、
Electronic instruments, a human "guinea pig" and a regular tool.
【正确答案】
D
【答案解析】
[分析] 由第一段的前两句综合所有的细节。
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