按化学成分碳素钢可分为普通碳素结构钢和优质碳素结构钢。
参考答案：对
—The food in that restaurant is delicious. I took lots of photos with my cell phone.
—Really? Could you show ______ to me?
A．it
B．them
C．they
D．their
人谓子产不仁，吾不（信）也。（《左传？襄公三十一年》）
