下列选项属于急性心肌梗死主要临床症状的是
A. 疼痛
B. 心律失常
C. 低血压和休克
D. 心力衰竭
Teachers should correct all the errors students make.
A. 对
B. 错
An error has an indirect relation with the learners language competence.
A. 对
B. 错
It suggested to interruptstudents during fluency work.
A. 对
B. 错