问题
选择题
At the meeting they discussed three different ____ to the study of mathematics. [ ]
A. approaches
B. means
C. methods
D. ways
答案
答案：A
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At the meeting they discussed three different ____ to the study of mathematics. [ ]
A. approaches
B. means
C. methods
D. ways
答案：A
，请写出另外一种同分异构体的结构简式________。