项目管理任务与组织的设定均须基于确定的项目管理（）之上。
A.规划
B.目标
C.计划
D.控制
参考答案：B
--- Were you at school when he came to see you ?
---- Yes, I __________ a math class .
A. had B. was having C. am having
某新生儿母亲向护士咨询如何预防佝偻病，护士指导其服用维生素D。
每天服用维生素D的剂量是（）
A.100U
B.150U
C.400U
D.2000U
E.1500U
