— It's dangerous to swim here. Look at the sign.
— Oh, I notice it. Thanks for telling me.
A:haven't
B:won't
C:don't
D:didn't
用正方形硬纸板做三棱柱盒子,每个盒子由3个长方形侧面和2个正三角形底面组成,硬纸板以如图两种方法裁剪(裁剪后边角料不再利用).
现有19张硬纸板,裁剪时 x 张用A方法,其余用B方法.
①构成氯化钠固体的微粒____;②改良酸性土壤的碱____;
③医疗上治疗胃酸过多的盐____;④司机饮料中不能含有的物质____。
图是草原生态系统中的食物网简图,请据图回答: