成人两上肢占体表面积的
A．18％
B．20％
C．25％
D．30％
E．35％
参考答案：A
真核生物中最主要的DNA修复系统是（）
A.光复活
B."适应性"反应
C.切除修复
D.复制后修复
E.呼救性修复
The crowd cheered wildly at the sight of liu xiang, who was reported _______ the world record in the 110-meter hurdle race.
A．breaking
B．having broken
C．to have broken
D．to break
