About ___ of the teahers is our school ___ young people under thirty.

A．two-five, are

B．second-fifth, is

C．two-fifths, are

D．two-fifths, is

川木香药材的气味（）

A.气强烈芳香，味苦辛

B.气微香，味苦，嚼之粘牙

C.气清香，味甜微辛，嚼之略带黏性

D.有特殊香气，味微甜

E.香气特异，味微甜、辛、苦