He has been told many times that his casual clothes are not ____ for some formal occasions．

A．innocent

B．appropriate

C．temporary

D．cautious

我国现存最早的药学专著是( )

A．《新修本草》
B．《炮炙论》
C．《神农本草经》
D．《中华本草》
E．《本草纲目》