可采用上肢下落试验来评定上肢肌张力，正常肌张力的表现为（）。

A.下落迅速

B.瞬间的下落，然后"卡住"并保持姿势

C.抵抗

D.慢慢下落

E.起始部分缓慢下落然后迅速落下

Up to now, the little boy is still unable to _______ to us what he meant just now.

A．get out

B．get across

C．get along

D．get about