—_______ I like it very much.
A:Yes, it is.
B:Yes, it isn't.
C:No, it isn't.
D:No, it is.
J____ from his face on which there was a confident smile, we know that he didn't lose heart.
在实验室的下列做法中正确的是
如图,将矩形ABCD沿EF折叠,使顶点C恰好落在AB边的中点C′上,点D落在D′处,C′D′交AE于点M.若AB=6,BC=9,则AM的长为____