为有效减少放射性药物对膀胱及周围器官的辐射损伤，应在检查后（）
A．饮水利尿
B．提前服用KClO4
C．缓泻剂
D．催吐剂
E．拮抗剂
参考答案：A
_______ the teachers in their school is about 200 and one fourth of them are _______ teachers.
A．A number of; women
B．A number of; woman
C．The number of; women
D．The number of; woman
已知∠A=70o，则∠A的余角是（ ）度．
