对企业营销活动富有吸引力的领域被称为_________。
A．风险业务
B．市场机会
C．困境业务
D．环境威胁
参考答案：B
—Judy’s never been late for school, ________ she?
—________. She is always the first to get to school every morning.
A．is; Yes
B．has; No
C．isn’t; Yes
D．hasn’t; No
尿毒症发生眼底改变的几率是()
A．60%
B．70%
C．80%
D．90%
E．几乎全部
