单项选择题
A．less expensive to be bulk than a bridge B．more expensive to be built than a bridge C．less expensive to be built than a rail D．more expensive to be built than a rail
A．be reasonably doubtful about them B．check ail their answers C．substitute them for basic thinking D．use them for business purpose only
A．a famous speaker B．a very handsome man C．President of the country D．a popular statesman