The president was _____ a speech to senators _____ a group of armed young people burst into the hall    [ ]

A. giving; as  

B. making; when    

C. delivering; while  

D. speaking; when

在足底按摩泡足时，抖动上肢应当（）。

A.快抖

B.慢抖

C.平抖、竖抖

D.上下抖

E.左右抖