Where is your cat? It's in the . [ ]
A. classroom
B. apple
C. cup
答案：A
Tomorrow is Sunday. Jim will go hiking with his friends if it ________.
A．isn’t rain
B．doesn’t rain
C．won’t rain
D．don’t rain
质量控制过程中，下列因素属于系统因素的是（）
A、温湿度微小波动
B、原材料规格、品种有误
C、原材料的微小差异
D、机器设备正常磨损
