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除了对创伤修复以外，近年发现的有关细胞生长因子最重要新功能为（） A. 细胞凋亡 B. 自噬 C. 代谢调控 D. 免疫调节

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When American Airlines decided to review new ideas aimed at first-class passengers on very long flights, like an ultra high-speed Wi-Fi service and 124 channels of high-definition satellite cable TV, their first step in the marketing research process was to ________.

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Australia is governed as a federal parliamentary democracy and achieved both its union and independence in 1901.
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