Official 18 Lec 1
Question 6 of 6
What does the professor imply about the discovery of a relationship between the sunspot cycle and Earth's geomagnetic cycle?

A.

It proved that Galileo's cloud hypothesis was correct

B.

It showed how conditions on Earth can affect the Sun

C.

It was the start of modern astronomy

D.

It led to a period of intense scientific research

正确答案:D

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