亲水凝胶基质
A．卡波普940B．丙二醇C．尼泊金甲酯D．氢氧化钠E．纯化水 指出上述处方中各成分的作用
参考答案：A
Whenever he was asked why he was late for class，he would answer carelessly，______ the same thing.
A．saying
B．said
C．to say
D．say
投资基金的风险可能小于（）。
A.股票
B.固定利率债券
C.浮动利率债券
D.债券
