单选题：What was the doctors' attitude toward 3D technology in the

题目内容：

What was the doctors' attitude toward 3D technology in the past? A．Apathetic.
B．Positive.
C．Disappointed.
D．Doubtful.

参考答案：

答案解析：

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Questions 16 to 19 are based on the passage you have just heard.A．It required al

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