下列除哪项外，均为破伤风的主要临床表现
A．牙关紧闭B．四肢抽搐C．不省人事D．苦笑面容E．项背强急和角弓反张
参考答案：C
—Would you mind opening the door? It's hot outside.
—___________. [ ]
A. Certainly not
B. Yes, please
C. Sorry, I won't
D. Thank you
砂浆的流动性
