is it from here Shantou to Guangzhou? It’s about one hour’s flight.A. How longB. How farC

问题补充：

is it from here Shantou to Guangzhou?

It’s about one hour’s flight.

A. How long

B. How far

C. How many

D. How soon

答案：

A. How long

(答案→)B. How far

C. How many

D. How soon

解析：根据答语可知询问的是距离，故用how far来提问。