If I can help____________ , I prefer living in Hangzhou because the weather here is better than ____________of Changsha.

A．that; that

B．it; that

C．that; one

D．it; it

菊花霜霉病的病症是（）。

A.褪绿斑

B.叶背霜状霉层

C.叶面白粉

D.叶面上的颗粒状物