DNA复制时辨认复制起始点主要靠
A．拓扑异构酶
B．解螺旋酶
C．引物酶
D．DnaA蛋白
参考答案：D
The ______ look on her face suggested that she _________ such a result.
A．puzzling; hadn’t expected
B．puzzled; hadn’t expected
C．puzzling; wouldn’t expect
D．puzzled; shouldn’t expect
房屋质量差，管理费还要交吗？
