下列哪项不是心包压塞征象
A．静脉压下降B．颈静脉怒张C．心音低钝、遥远D．心尖搏动消失E．奇脉
参考答案：A
Once harm is _______ to the eco-system, all species will ________, including man himself. [ ]
A. made; be in danger
B. done; be dangerous
C. caused; be endangered
D. done; be in danger
0×1×2×3＞0+1+2+3．______．（判断对错）
