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为什么世界上生物大多都是对称的.周围事物.据我观察,只要有生命的都是对称的,为什么?我所指的是外形大致对称,比如大树中树干圆形对称,树叶也对称,人的外形也对称,单细胞动物也是外形 为什么所有的生物都是对称的 HE watches TV every day He is watches TV every day（改错）并说明为什么 圣诞节英文邀请函怎样写 "Mum,this is my friend Eric."、“And Eric ,this is my Mum,Mrs Lopez.”哪句放前面? 以my friend-eric写作文eric是我朋友,他喜欢打球.他有3个足球,2个篮球 5个排球10块乒乓球拍4个网球他在学校打蓝球,晚上喜欢在电视上看棒球赛.他非常喜欢运动 Dad ,he is my friend ,Eric这句话哪里错了 不定式与过去分词作定语there is nothing to do 与 there is nothing to be done有什么区别?为什么大多数用to do?如果是主动表被动,但那不是只有want get have等词才可以这样说么?另外,it‘s nothing added but time we were ready to dislike the new people even before they came. 求一封英语邀请函用Emill给John Broun 发一封邀请函大概内容：已收到他3月12日的来信.请他与本月25日来我公司讨论合作细节（detalis).请他提前将所乘航班,我们将派司机去接他. 英语翻译In its monolayer form,graphene is a one-atom-thick two-dimensional material with excellent electrical,mechanical,and thermal properties.Large-scale production of high-quality graphene is attracting an increasing amount of attention.Chemic 英语翻译Dear Nancy ,My name is Xiao Ming.I want to be in a club in our school.I’m not famous now.But maybe I can be famous someday!I can’t sing or dance or act in movies,but I can do many other things.I can play three instruments:the guitar,t 夏至雨绵绵的前一句是什么 스타일] 트로트 일렉트릭 로미오是什么意思? 7.We were told that the stone figure _______ back to the 16th century was of great value.A. dated B. dating C. coming D. kept 오빤 강남스타일啥意思? Jack is twice as oid as bill.Jack is twice as old as Bill. 模糊的近义词是什么? “芒种火烧天”后半句是什么? 일본족제비 일일 투쟁是什么意思啊? 파일是什么意思 일일 관광 迷失4剧情怎么那么乱?他们都回到外界了吗?怎么HUGO又回到了神经病院jack来看他 sayid的上司怎么是ben 现在邹城沐浴春光怎么样?价位、服务等?其他娱乐点也可以推荐一下. we like _____(颜色鲜艳的）clothes How much is the card 同义句The Greens are watching TV （同义句） 在How much____the chicken?中_____填is还是are?还有是不是在陈述句中比如“他有枪.”用英文说就是“He has gun.”但如果是在疑问句中has就又变成了have?这个Has怎么用?不懂. 甘地的"非暴力不合作运动"用英语怎么说 无论做什么事情,都应该三思而后行.改反问句 RED的比较级