DNA复制需要
A．拓扑异构酶
B．RNA聚合酶
C．DNA连接酶
D．解链酶
参考答案：A,B,C,D
.They were known as “ aborigines”, _____ “the first people of the country”.
A．it means
B．which mean
C．that means
D．meaning
1250平方米=______公顷
125克=______千克．
