肾盂的形态多数为
A．壶腹形B．圆形C．枝形D．喇叭状E．卵圆形
参考答案：D
解析：肾盂的形态多数为喇叭状。
The farmers ________ on the farm when a UFO flew over their heads. [ ]
A. worked
B. work
C. are working
D. were working
绩效考核评价方法是绩效考评的具体（）与手段。
A.原则
B.方法
C.依据
D.条件
