超声引导介入治疗的优点包括（）.
A.灵活
B.并发症少
C.并发症多
D.价廉
E.昂贵
参考答案：A, B, D
胰、胃肠均分泌的激素有（）
A.胰泌素
B.胃泌素
C.胰酶素
D.胰多肽
E.胰岛素
It was at school _____ he had studied _______ we met him last night.
A．where; that
B．that; that
C．that; where
D．where; where
