题目

—Excuse me, could you please show me how to use this new machine?     —______________.   A. Certainly! It’s here   B. That’s up to you   C. Sure, with pleasure   D. Not at all 答案：C   若，则4x与sin3x的大小关系是 [　　] A．4x＞sin3x B．4x＜sin3x C．4x≥sin3x D．与x的值有关