化简求值: 2( a2-2a-2)+ (-a2+a+4),a=-2.
读下面四幅“海陆风示意图”,判断近地面大气运动的正确流向是( )①陆地—海洋 ④陆地—海洋 ③陆地—海洋 ②陆地—海洋 A.
Being a parent is not always easy, and being the parent of a child with special needs often carries with ___extra stress. A. it B. them C.
价值规律作用的实现有赖于 ①市场竞争 ②劳动生产率的提高 ③价格波
株洲沿江风光带有一段人造沙滩,在炙热的夏天赤脚踩在沙滩上感觉烫脚,而站在湘江边得浅水滩处却感觉到凉爽。形成这种现象的原因,下面解释正