【单选题】How would the man go to Shanghai?
C.
Either by plane or by train.
【单选题】力的国际单位是牛顿,简称“牛”,国际符号为( )
【单选题】How much more would the man spend if he buys the tickets on the black market?
【单选题】How much would the man pay for the gift?
【简答题】频率的单位是______,简称赫,符号______.
【单选题】How would the man pay for his purchase?