—What are you mailing, Tom?

— A textbook      a new method of teaching physics. I want my friends to take a look at it.

A．is based on

B．based on

C．basing upon

D．which based upon

小青龙汤证的病机是（）

A.风寒束表，阳郁化热

B.风寒束表，水饮内停

C.风寒犯表，卫闭营郁

D.风寒袭表，卫强营弱

E.素有郁热，复感风寒