Eta Carinae is now engaging in The word "period" in Paragraph 3 means the length of time

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问题 Eta Carinae is now engaging in
The word "period" in Paragraph 3 means the length of time

选项 A、over which stars vary in brightness.
B、for which Eta Carinae’s brightening lasts.
C、Eta Carinae takes to become a supernova.
D、it takes the laser from Eta Carinae to travel to the earth.

答案A

解析
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