题干
选出恰当的应答语（ ）
A：They are walking．
B：Because it's cool in fall．
C：I like winter best．
答案(点此获取答案解析）
C
选出恰当的应答语（ ）
A：They are walking．
B：Because it's cool in fall．
C：I like winter best．
的展开式中x的系数是 ( )