Official 8 Lec 3
Question 3 of 6
What does the professor imply about the invention of eyeglasses?

A.

Its historical records are more detailed than those of other inventions.

B.

It has little impact on social attitudes toward vision correction.

C.

Its occurrence in different places at approximately the same time is not unusual.

D.

It contributed to a substantial increase in the number of literate people.

正确答案:C

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