Of the two readable books, which do you think is ______ one for me to read?

A．a more suitable

B．more suitable

C．a suitable

D．the more suitable

下列说法中不正确的是[ ]

A．生铁的含碳量比钢多

B．生铁和钢都是铁的合金

C．球墨铸铁机械强度较差，主要用于炼钢

D．炼铁的主要设备是高炉，炼钢的主要设备是转炉、电炉或平炉