促使以下交通工具出现的重大发明分别是

A．蒸汽机电动机

B．电动机蒸汽机

C．电动机内燃机

D．蒸气机内燃机

—There _____ little fresh water _____.

—Don't worry. We'll soon get out of the desert.[ ]

A. has; drinking    

B. are; to drink  

C. is; to drink      

D. are; drinking