单项选择题

药物的肾小管重吸收主要机制是（）。

A.促进扩散
B.主动转运
C.被动扩散
D.膜孔转运
E.胞饮作用

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真菌耐青霉素是因为

A．有对抗青霉素的酶
B．无细胞壁
C．细胞壁无肽聚糖
D．长期使用产生耐药性
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Which of the following is likely to have the most price elastic demand?
A、Clothing.
B、Blue jeans.
C、Levis jeans.
D、All three would have the same elasticity of demand because they are all related.