Forsolution(1)heat toboiling 0.5g powderwith 5 mlofethanol，cool andcen trifuge，decant me supernatant liquid immediately and use within 30 minutes．What procedures are employed in the above experiment（）

A．“岂不善乎”的“岂”
B．“天下之病孰有多於温病者乎”的“孰”
C．“皮之不存，毛将安附焉”的“焉”
D．“余何人斯”的“何”
E．“至於相合而之他藏，致他疾者，庸可易知耶”的“庸”

A．Aluminum Oxide G
B．methanol
C．silica gel G
D．xylene
E．calcium sulphide