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A conversation with your faraway friend is useless.()

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Syntactically, Japanese is an isolating language.()

The term accent is used for less drastic difference which is restricted to variation in pronunciation.()

既能与金属钠反应，又能与氢氧化钠反应，还能与碳酸钠反应的是

A. HCOOH
B. CH3OH
C. HCOOCH3
D. C6H5OH
E. CHCH

Language contains two subsystems: sounds and meanings.()