适应于急进性肾炎Ⅰ型治疗（）。
A．血液透析
B．激素冲击治疗
C．环磷酰胺
D．抗菌药物
E．肾移植
参考答案：B
It _____ Jack twenty minutes _____ the math problem yesterday. [ ]
A. took, to work out
B. takes, to work out
C. has taken, working out
D. is taking, working
将图中所示的变阻器接入电路中，当滑片向左移动时，电阻减小，下列哪种接法正确
A a和b B c和d C a和d D b 和c
