The baby is well ________ in a thick cotton coat preventing the coldness from outside.
句意：婴儿被裹在厚厚的棉衣里以抵挡外面的寒冷。wrap up包起来；严密裹住；包扎。roll up 卷起；滚滚上升。pack up整理；把……打包。fold up折叠，折起。故选A。