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【单选题】
An idiom consists of at least two words. Each has a single meaning and often functions as one word. This is called ______.A.
semantic unity
B.
structural stability
C.
rhetorical function
D.
none of the above
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A.
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B.
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C.
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D.
巴比妥类药物具有酰亚胺结构，易发生水解开环反应
E.
巴比妥类药物的水溶性钠盐可与某些重金属离子形成难溶性盐类
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