—Do you know       ?

—At the end of July.

A．how soon is your sister coming back home

B．how often Nancy hears from her pen friend

C．when the meeting will be held

D．when will the new computer game come out

乳香.没药宜采用的粉碎方法为（）。

A.串油法

B.串料法

C.串研法

D.蒸罐法

E.低温粉碎法