His waltzes _____ him famous all over Europe.[ ]
A. kept
B. made
C. felt
答案：B
下列何药对肉瘤疗效好：
A．丝裂霉素B．博来霉素C．环磷酰胺D．甲氨蝶呤E．卡莫司汀
电路中有电流的条件一是电路中必须有______，二是电路形成______；我们规定______电荷移动的方向为电流方向（选填“正”、“负”）．
