单项选择题

三种组元组成的试样在空气中用X射线衍射分析（XRD）其随温度变化而发生相变的情况，最多可记录到（）共存。

A．三相
B．四相
C．两相
D．五相

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'An refer to Confucius even though he was dead 2,000 years ago. ' This shows that language has the design feature of______.A.arbitrarinessB.creativityC.dualityD.displacement

A.A.arbitrariness
B.creativity
C.duality
D.displacement

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Illustrate the significance of studying speech Sounds in linguistics.

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