单项选择题

虹膜（）
A. 分泌房水

B. 是中膜的中间部分

C. 内含瞳孔开大肌，为副交感神经支配

D. 为脉络膜的一部分

E. 颜色因人种而异

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单项选择题

Which of the following is right about men’s beauty care?
A、Men are obsessed with women’s opinion on looks.
B、Men mostly focus on perfume.
C、Men spend 4 minutes on their skin care on average.
D、Men are fine with being average-looking.

In hydrogen evolution reaction, platinum (Pt)-based materials are advocated as the best candidates due to their strong hydrogen adsorption strength.

答案：错误