What does 侯立明 think of Chinese parents sending their ki...
单项选择题What does 侯立明 think of Chinese parents sending their kids to study English abroad?
A．It is a good experience to live in American families to learn English.
B．It can be a good experience so they can get a different angle of education.
C．It is a good experience to study in an English-speaking country.
s,速度为0.6c的该介子的寿命是( )s。 A. 
B. 
C. 