合格的服务员四个基本要求？
参考答案：
举止端庄，动作文明，坐要正直，不前俯后靠。
As we all know,________, the pollution will get worse and worse.
A．not if carefully dealt with
B．until not carefully dealt with
C．if not carefully dealt with
D．when not carefully dealt with
中年女性患者，尿频、尿痛、尿急3个月余，伴尿液混浊，一般抗菌药物治疗无效，下一步应先做哪项检查（）
A.CT
B.排泄性肾盂造影
C.膀胱镜检查
D.逆行肾盂造影
E.膀胱造影
