A:Oh. I’m afraid I didn’t cook very well.
B:I’m glad you enjoy it.
C:Come again when you are free.
D:It’s not polite of you to say so.
This way of shifting the blame onto others is ________ clever.
如图,将△ABC沿DE翻折,折痕DE∥BC,若ADBD=12,BC=6,则DE长等于( )
在大型运动会比赛上,运动员要进行尿检和血检,你一定知道下列哪项物质最有可能是兴奋剂的成分( )。