太阳蓄水证可见( )

A．邪热壅肺
B．热扰胸膈
C．热结肠道
D．热郁胆经
E．热在肺胃

A man drove his automobile d₁ kilometers at the rate of r₁ kilometers per hour and an additional d₂ kilometers at the rate of r₂ kilometers per hour. In terms of d₁, d₂, r₁, r₂, what was his average speed, in kilometers per hour, for the entire trip ？（）

A.A

B.B

C.C

D.D

E.E