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【参考答案】

happy/fast/exciting
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将their改为its。
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Special words used in technical discussion ______.[A] never last long [C] should be confined to scientific fields[B] are considered artificial language speech [D] may become part of common speech
A．Special words used in technical discussion ______.
B．never last long
C．are considered artificial language speech
D．should be confined to scientific fields
E．may become part of common speech
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