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
教育计划