下列哪种情况不易发生急性心肌梗死（）
A.夜间发生心绞痛
B.变异性心绞痛
C.稳定性心绞痛
D.恶化劳力性心绞痛
E.新近发生心绞痛
参考答案：C
It's ten years since the scientist ___on his life's work of discovering the valuable chemical.[ ]
A. made for
B. set out
C. took off
D. turned up
对症治疗是指药物的作用在于消除疾病的原发致病因子。
