遵照买卖平衡的原则，商业银行在买卖外汇后，立即进行平衡。

This one is ____________ than that one. [ ]

A. bigger

B. big

C. biggest

The man who was being followed stopped from time to time ____ he wanted to tie his shoelaces.

A．as if

B．like

C．what

D．as

简述生态对策理论如何在应用农业生态系统中。

信息反馈的形式有()正反反馈纵横向反馈

A.前反馈

B.后反馈

C.水平反馈

D.垂直反馈

现代知识产权法是一个封闭式的法律体系。