easy复数形式

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• 该段话标点的使用主体往往只能以一个对象或者一组对象的形式出现（）这样才能鲜明准确地突出主体（）它的作用如同千军万马中的统帅,是整幅画面引人关注的焦点所在.
• 请例举两种动物群体中信息交流的形式：______、______．
• would you like some pears?--No,thanks.I think there ___ enough for usA.is B.are C,has been D.had beenc是不是应该改为have been因为pears 是复数,B也错了,因为要用完成时态请问,你觉得呢?
• 一条简便运算题1-{2/[1*（1+2）]}-{3/[（1+2）*(1+2+3)]}-```-{10/[(1+``+9)*(1+``+10)]},请大家先化成分数形式,再拆去括号,这样会更易明!记得要有过程（详细易明,最好用分数形式表示出来,尽量减少括号） 备注：我是名初一生
• I can see with them.改写成第三人称he,还有就是改写后,用不用把一些词改成适当的形式啊?那把I like toplay and have fun改写成改写成第三人称he,还有就是改写后,用不用把一些词改成适当的形式啊?
• forget to do remember to do stop to do的否定形式什么时候是 not to do什么时候是dont ?谢谢了
• 用括号内所给词的正确形式完成短文For ____(us)vacatian we went to Arizona(亚利桑那)in the USA.We went on a river trip on the ____(one) day.we did ___(any) boating (划船）.On the second day,we___(walk) in the mountains and we ___(do) some horse riding(骑马). The food there ____(be) also great. It was a great vacation ,but it was too short ! We___(want) to go there again but there ___(be not )enough time.
• 无论是二元一次方程还是二元一次方程组都应该写成什么形式?
• 1.Mr Green often helps those students ____he thinks are not quick at their lessons.a.whom b.who c.when d.becausethose students 不是help的宾语吗?为什么不选a 2.The old man has two sons,____looks like him.a.all of them b.both of them c.each of them d.neither of them 先排除一下a和b,c 和d都可以用单数形式啊,为什么答案选d而不选c?3.____to see the film please raise the hands.a.Those who wants b,those who want c.Any one wants d.People want4.The reason ____being late for the meeting was _____his l
• 一个圆锥底面直径为d高为h它的体积是v=
• 凸透镜和平面镜均能使物体成虚像，比较它们所成的虚像，以下说法正确的是（　　） A.所成的虚像均是正立的 B.虚像的大小均与物体到镜的距离有关 C.观察虚像时，眼睛与物体均应在镜的