He is too young to go to school,             he ? [ ]

A. is

B. was

C. isn't

D. wasn't

上海市既缺煤炭，又缺铁矿石，却发展了钢铁工业，主要考虑的因素是[ ]

A、交通运输条件

B、接近消费市场

C、国防安全需要

D、城乡结合