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
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