味精在超过（）度后产生毒性。
A、90
B、100
C、110
D、130
参考答案：D
--Would you like to go to aquarium with me tomorrow ?
---Sorry . I there twice this year and don’t want to go there again.
A．have been
B．was going
C．am going
D．have gone
行保留灌肠时灌肠液量不宜超过：（）
A.100ml
B.200ml
C.300ml
D.400ml
E.500ml
