—Help yourself to some fish.—Thanks. Oh, it tastes so ___________.
A:good
B:well
C:bad
D:badly
325﹣147﹣53____325﹣(147﹣53)
135×32____135×8×4
57×99+57____44×25×3
4×9×25____(4+25)×9.
下列各项中不属于变异的是( )