种群在哪个范围内个体最多（）？
A、不能耐受带
B、生理紧张带
C、量适范围
D、生理丰富带
参考答案：D
—How about singing songs with me?
—I’m sorry I can’t. I help my father with his work.
A. have to B. can C. may
急性心肌梗死心肌损伤的心电图改变是
A．ST段下移B．ST段明显上抬，呈弓背向上的单向曲线C．T波高耸D．T波倒置E．异常深而宽的Q波
