以下哪项是传真机所不具有的功能()
A．复印
B．电话
C．传真
D．上网
参考答案：D
13. After working hard for many years, .
A．his dream was realized
B．his dream came true
C．he came true his dream
D．he realized his dream
紫外线对DNA的损伤主要是
A．形成嘧啶二聚物
B．导致碱基缺失
C．发生碱基插入
D．使磷酸二酯键断裂
