破伤风最最出现并有诊断意义的症状是：（）
A.苦笑面容
B.张口困难
C.角弓反张
D.腹肌紧张
E.颈项强直
参考答案：B
改错。
( ) 1. We car is blue. _______________
A B C
( ) 2. They is small animals. _______________
( ) 3. How are your now? _______________
( ) 4. Do he have a doll? _______________
( ) 5. Can I have four pen? _______________
访问外部程序存储器可以采用哪些寻址方式？
