Root also falls into two categories:free and bound.(北二外2006研）
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A stem is the base form of a word which cannot be further analyzed without total loss of identity.（对外经贸2006研）
A. 对
B. 错
The words “boys” and “raise” have a common phoneme and a common morpheme as well.(北二外2008研）
A. 对
B. 错
Radar is an example of acronym.(北二外2012)
A. 对
B. 错
海姆立克急救法用力的方向为( )
A. 向内向上
B. 向内向下
C. 向外向上
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