下列运算正确的是( )
A:x+y=xy
B:5x2y﹣4x2y=x2y
C:x2+3x3=4x5
D:5x3﹣2x3=3
巴西的农产品丰富,美国需要从巴西大量进口的有( )
—Let's go to watch the cosplay show!—Sorry, I . I have to go to my guitar lesson.