根据句义，用括号内所给词的适当形式填空。

小题1: The old should be spoken to ______(polite).

小题2:My family lives in the ______(center) part of the city.

小题3:He is too ______(care) to pass the final exam.

小题4: Poetry is a beautiful way to express ______(think) and feelings.

小题5: Children’s ______(expect) ideas often surprise the adults.

以下哪种效应不是通过兴奋M受体实现的()

A．心肌收缩力减弱

B．支气管平滑肌收缩

C．胃肠道平滑肌收缩

D．膀胱逼尿肌收缩

E．膀胱括约肌收缩