带式输送机托辊不转动，可能的原因是（）
A、负载过大
B、输送带张力过小
C、托辊内进入杂物
D、输送带跑偏
参考答案：C
（庄子的）和“得意忘言”说
People cannot but feel _____, for they simply cannot understand how he could have made such a stupid mistake.
A．puzzled
B．delighted
C．comforted
D．inspired
