It is required that the students _____ mobile phones in their school, so seldom _____ them using one. [ ]

A. shouldn't be used; will you see

B. not use; will you see

C. don't use ;will you see

D. shan't use; you will see

氨基酸由肠腔吸收是通过

A．原发性主动转运
B．经载体易化扩散
C．继发性主动转运
D．经通道易化扩散
E．出胞作用