____ ____ ____ the children visit the museum?
a、b、c三盏灯分别标有“110V 20W”、“220V 40W”、“36V 60W”的字样,三盏灯都正常发光,比较它们的亮度( )
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.