单项选择题

Questions 17--20 are based on the following story about Einstein’s life. You now have 20 seconds to read Questions 17--20.
What is Einstein’s greatest contribution to human beings

A．His teaching.
B．His theory of relativity.
C．His theory on advanced mathematics.
D．His research.

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单项选择题

Questions 17--20 are based on the following story about Einstein’s life. You now have 20 seconds to read Questions 17--20. What is Einstein’s greatest contribution to human beings 您的浏览器不支持 audio 元素。