Sally took a photo of her friends while they ______ computer games.

A．played

B．were playing

C．had played

D．play

能导致直立性低血压的药物是（）。

A.酚妥拉明

B.山莨菪碱

C.异丙肾上腺素

D.普萘洛尔

E.间羟胺