问题
单项选择题
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
A.an annual
B.a constant
C.a variable
D.an unstable
答案
参考答案：A
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The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
A.an annual
B.a constant
C.a variable
D.an unstable
参考答案：A