选择题：由间隔不等的时点数列计算平均发展水平，以为权数A、时期长度B、时点长度C、间隔长度D、指标值项数

商品包装包括若干个因素，（ ）是最主要的构成要素，在整体包装上应居突出地位。A.商标或品牌B.图案C.包装材料D.形状

16.Female speakers are not so impressive as male speakers (Sexism in School )

A survey was carried out on the death rate of new born babies in that region,___

My cousin likes eating very much, but he isn’t very particular about the food he

这种棉布下水不会缩。