题干
－How are you?
－_____________
A：How are you?
B：Fine, thanks.
C：How old are you?
D：And you?
答案(点此获取答案解析）
B
－How are you?
－_____________
A：How are you?
B：Fine, thanks.
C：How old are you?
D：And you?
)是重要的化工原料，其一种合成路线如下：
