化油器按后管处空气流动方向的不同，可以分为上吸式、（）和下吸式三种

A、单喉管式

B、双重喉管式

C、中吸式

D、平吸式

Lucy has ________ all of the goals she set for herself in high school and is ready for new challenges at

university. [ ]

A. acquired  

B. finished

C. concluded  

D. achieved