_____clearly so that your teacher_____you correctly.

A．Write, can understand

B．Having written, can understand

C．To write, could understand

D．Writing, will understand

关于药物跨膜转运的叙述中错误的是（）

A.弱酸性药物在酸性环境易转运

B.弱酸性药物在碱性环境易转运

C.弱碱性药物在碱性环境易吸收

D.弱碱性药物在酸性环境不易转运

E.溶液pH的变化对弱酸性和弱碱性药物的转运影响大