选出正确的单词。
dress T-shirt dress short dresses shirt blouse shorts
如图,物体AB在平面镜前,所成的像为A′B′.若在镜后PQ处放一块不透明的塑料,则像A′B′将会( )
—I always get ______ before the exam and I can't go to sleep!
—You should relax yourself.
29+17=46
____.
763-236=527
幂函数f(x)=xn的图象过点 (2,2) ,则f(9)=____ .