钝角（ ）90°而小于180°，周角（ ）360°，锐角（ ）90°，平角（ ）180°。
大于；等于；小于；等于
— Did Tom's parents go to the meeting yesterday?
— Yes, ____ of them did, but ____ spoke. [ ]
A. each, none
B. both, none
C. neither, both
D. both, neither
蟾酥的药用部位是
A．贝壳
B．干燥分泌物
C．角
D．除去内脏的干燥体
E．病理产物
