单项选择题

肉质直根有下列哪种根发育而来
A、不定根
B、块根
C、主根
D、侧根

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单项选择题
The luxury products sales in China is increasing year by year in a steady pace, and there is forecasting that it will be likely to reach 617 billion yuan in 2021. This is mainly influenced by ( ). A. Political factor B. Demographic factor C. Technological factor D. Economic factor (The influence of income distribution)
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服务管理，直接面对受益人，包括：()
A、登记
B、资格审定
C、档案管理
D、信息处理
E、待遇支付
F、咨询服务
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