分别标有“6V,2W”和“12V,8W”的两个灯泡,串联后接在电路中,为使其中一个恰能正常发光,加在电路两端的电压应是( )
A:6V
B:12V
C:18V
D:24V
Being happy is a skill that can be learned like a foreign language, and one way to ______ ourselves to be happy is to write down the little things that cheer us up each day.
人的听觉感受器位于( )