单选题What does the wordconstant (Line 2, Para. 3) mean in the passage?AThe same.BAmount.CGoing up and down.DChanging.
单选题
What does the wordconstant (Line 2, Para. 3) mean in the passage?
A
The same.
B
Amount.
C
Going up and down.
D
Changing.
参考解析
解析：
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