Beijing is cold this time _____. You need _____ warm clothes if you go there.          [ ]

A. of  the year, to pack          

B. of  year, packing

C. of  year, pack              

D. of  year, to pack

对升丹过敏者，提脓祛腐时宜选用( )

A．红灵丹

B．黑虎丹

C．以上都不是

D．平胬丹

E．八宝丹