15.B当小球在槽内由A到B的过程中,墙型对精有力的作用小球与半情组成的系统水平方向动量不守包故AC错误,B正确当小球运动到C点时,它的网个分运动的合速度方向是右上方以此后小球将做斜上抛运动,即C错误

28.【答案】A(扮举中妈)关探芒【意应3解析】根据第三段内容下vLm【命题意图】细节理解题co-sponsored the bill, said an 8-year-old girl namBritten inspired him to write the proposal. Low said that Britten didn't understand why a storwas telling her which toys were meant for boys and which were for girls:"可知,应选A实》,8E29.【答案】D全回首四意大,素注【沿命【命题意图】词义猜测题【解析】根据第四段内容可知,后面举到的例子都是采用了同样的举措,根据最后Target got rid of gender labels on children' 8 toys back in2015.可以推断出,画线单词和get《宗答30.【答案】B(文可出中)关细【例命【解析】根据第五段的主题句: Such moves have taken place as a growing body of aca【命题意图】主旨大意题research has shown that gender-specific toys can hold back a child's emotional and psycholgrowth.及全段内容可知,改变主要讲的是对玩具按性别分类带来的不良后果,故选B31.【答案】C(形国别)关伸直图意温命【解析】根据最后一段: Parents who want thcir kids to develop more fully academically,【命题意图】推理判断题musically, artistically and socially should choose gender-neutral toys, Blakemore recommended可知,不区分性别的玩具能促进孩子全面发展,故选C空亲一案

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