问题描述：
some words in the basic word stlock are said to be stable because they___?
a.are complex words
b.are technical words
c.refer to the commonest things in life
d.denote the mst inportant concepts
a.are complex words
b.are technical words
c.refer to the commonest things in life
d.denote the mst inportant concepts
问题解答：
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