单项选择题What do we learn about America’s manufacturing in the 1950s()
A.It generated just 12% of the gross national income. B.It constituted 28% of the gross domestic product. C.It was the biggest employer of American workers. D.It was the most active sector of American economy.
单项选择题A.He will be back in a minute to repair the computers.B.It will take longer to reconnect the computers to the Net.C.He has tackled more complicated problems than this.D.A lot of cool stuff will be available online tomorrow.