AA级绿色食品等同于（）
A、可食食品
B、甲级食品
C、有机食品
D、乙级食品
参考答案：C
Li Lei often ________ with his friends to go camping during the summer holiday. [ ]
A. hung out
B. hangs out
C. sent out
D. give out
电子控制燃油泵喷射按控制方式分类可分成开环控制和（）
