假定去年生产1克黄金的社会必要劳动时间是生产1克白银的社会必要劳动时间的8倍,且5件A商品=2克黄金。如果今年全社会生产黄金的劳动生产率提高1倍,那么5件A商品的价格用白银表示为( )
Tom isn’t a boy. He is an boy.
--- is the pen? --- It’s black red.
This is English book and that is Chinese book.
--- Do you like your school? ---_________
--- Are you Kate? ---