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【单选题】It seems hard to watch someone yawn and not to yawn ourselves. Even reading about yawning can make you do it. Now, a new study has found why yawning has such a powerful force. Yawning when others yawn...
A.
It is natural to yawn back if people around you yawn.
B.
Some kids are too young to yawn after others.
C.
Yawning can be used to test children’s development.
D.
Kids with autism yawn easily when others yawn.
【简答题】下列各组句子中，加线词意义和用法同的一项是（ ）
A.
唯君图之项伯乃夜驰之沛公军
B.
夜缒而出今人有大功而击之
C.
使工以药淬之而乃以手共搏之
D.
良曰：长于臣使人言于项羽
【单选题】姿势位的生理意义
A.
是升颌肌的牵张反射调节产生的，可使咀嚼系统基本不承受负荷
B.
升降下颌诸肌不收缩，可使咀嚼肌得到充分休息
C.
形成息止牙牙合间隙，可以使舌位于此间隙内
D.
便于下颌处于牙尖交错位
E.
便于下颌由牙尖交错位自如地运动到其他位