减数分裂过程中，着丝点分裂发生在[ ]
A．减数分裂间期
B．减数第一次分裂后期
C．减数第二次分裂后期
D．同源染色体联会时
答案：C
As they had been _____ our army for a week, the enemy had no choicebut to surrender (投降). [ ]
A. surrounding
B. surrounded
C. surrounded by
D. surrounding with
急性心肌梗死时，对诊断最有价值的心电图改变是（）
A.病理性Q波伴ST段呈弓背向上型抬高，与T波形成单项曲线
B.T波倒置0.2mV
C.T波异常高耸，呈帐篷型改变
D.Q波>同导联R波1／5
E.频发室性早搏
