叠加原理适用于（）的计算，不能用来计算功率，因为功率与电流、电压的关系不是线性关系。

A．线性电路

B．非线性电路

C．功率

D．所有电路

The Cognitive Approach seeks in ______ as basis for second language teaching.

A．American structural linguistics and behavioural psychology

B．structural linguistics and cognitive psychology

C．functional linguistics and habit-formation theory

D．transformational grammar and cognitive psychology