堆取料工停车后应（）操作台上的总电源开关。
参考答案：切断
Look left and right before you cross the road, ______ you may be hit by a car. [ ]
A. so
B. and
C. or
D. but
我国禁止在婴儿食品中使用的甜味剂是
A．糖精钠B．木糖醇C．安赛蜜D．甜蜜素E．阿斯巴甜
