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以下哪个不属于可生物降解高分子生物材料 A. 聚乙烯 B. 聚乳酸 C. 聚乙醇酸 D. 聚（多元醇癸二酸酯

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(https://chinesepod.com/tools/pronunciation/section/10)

The x in Xiaoye’s name is kind of hard to pronounce. It actually can be found in the transition from sh- in push and –y in yes. Let’s try it: (sh-) x (-y). And you see an i which is pronounced as ee. So Xi with the first tone is xī.
Question 1 Which one is xiǎo (small)?

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大叶性肺炎灰色肝样变期的临床表现与红色肝样变期不同点在于（）。 A. 开始出现肺实变体征 B. 呼吸困难有所缓解 C. 胸痛 D. X线呈大片状致密阴影