风疹所致皮疹为()
A．发热后出现
B．为充血性斑丘疹
C．经2～3天后消退
D．留有色素沉着
E．多见于面部、躯干
参考答案：A, B, C, E
镁元素的原子结构示意图(右图)
该元素的原子核内有______个质子,该元素在化学变化中易失电子形成的离子符号为______
_____ for the free tickets, I would not have gone to the films so often.
A．If it is not
B．Were it not
C．Had it not been
D．If it were not
