麻黄发汗作用的主要机制是（）.

A．扩张血管

B．收缩血管

C．抑制汗腺导管对Na⁺的重吸收

D．促进汗腺导管对Na⁺的重吸收

E．兴奋交感神经

It is believed that today’s pop music can serve as a creative force()stimulating the thinking of its listeners.

A. by

B. with

C. at

D. on