在保证床头柜开关使用正常方面，要求做到无（）的清洁保养质量标准。
A、漏电、无污渍
B、油渍、无磨损
C、脱色、无污渍
D、损坏、无模糊
参考答案：C
—Do you think he will do me a favor?
— As far as I know, he is the last one to help others. He______be prepared to give you a hand, though.
A．might
B．must
C．can
D．should
英译中（Translate）：integral protein（）
