下列计算中正确的是 [ ]
A．a2+a3=2a5
B．a2·a3=a5
C．a2·a3=a6
D．a2+a3=a5
答案：B
—My brother and I will go to the library tomorrow.
— . Shall we go together?
A．So do I
B．So I do
C．So will I
D．So I will
尘埃与下雨有多大关联？
