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【单选题】
列描述幼儿语音发展特点错误的是（）A.
发音正确率随年龄增长而逐渐提高
B.
幼儿的辨音能力先于发音能力
C.
幼儿末期基本可以掌握民族语言的所有的语音
D.
语音发展的飞跃期是5-6岁
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举一反三
【单选题】The evil manners would be ______ root and branch due to the forceful action taken by the local government.
A.
exterminated
B.
exemplified
C.
facilitated
D.
emitted
【单选题】The rising phase of the action potential is due to
A.
Na+ flow into the cell only.
B.
Na+ flow out of the cell only.
C.
K+ flow out of the cell only.
D.
K+ flow into the cell only.
E.
Na+ flow out of the cell and K+ flow into the cell.
【单选题】A vessel may be unable to take proper and effective action due to the speed（）too high or，in some circumstances，too low.
A.
is
B.
is to be
C.
will be
D.
being
【单选题】The rise in the action potential of nerve fibers is due to( )
A.
K+ enters the cell
B.
K+ moves from cell to extracellular
C.
Na+ enters the cell
D.
Na+ moves from cell to extracellular
【单选题】About the forming mechanism of action potential, ascending branch is due to ( )
A.
K+ excurrent flow
B.
K+ incurrent flow
C.
Na+ excurrent flow
D.
Na+ incurrent flow
【单选题】The one-way nature of action potential propagation down an axon is primarily due to
A.
sodium ion depletion
B.
potassium ion depletion
C.
the refractory period
D.
ATP loss
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