最易透过血脑屏障扩散入脑的是()
A．蛋白
B．无机离子
C．有机小分子
D．激素
E．气体
参考答案：E
We were finally able to make the customers _______ of the quality of the refrigerator. [ ]
A. to convince
B. convincing
C. convince
D. convinced
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