Labors share of income in rich countries has been shrinking mainly because of______. A．the rapid increase of global labour supply B．the low educational level of extra workers C．the opening up of once-communist countries D．the higher ratio of each country's exports to GDP
A. A．the B.the C.the D.the
【参考答案】
A 根据第二段最后一句“Withthissurgeofcompetition，youmightexpectla......