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受精的含义是（）A精子和卵细胞接触 B精子的头部进入卵细胞中C精子的细胞核与卵细胞的核融合 D许多个精子进入卵细胞中 受精意义是什么 白杨树的简介知道吗? 快 He is old,but he has all his own t()括号中填tooth或teeth He is old.but he has a very healthy______.A.walk B.life C.group D.teethHe knows it istn't good_____him.A.for B.out C.at D.in 我英语非常烂,请问如何提高上去一些?我理科生,属于严重偏科的,从初中到现在快高三了,英语可以说几乎没读,懂的单词非常少,语法定语从句之类的懂得一些,考试起来大多是乱填,考个十来分 7题,用适当的介词和副词填空,thank you very much! 怎样呢提高英语.英语超烂的说,羞羞啊 猜一个成语,这个是什么成语呢 A private collector is a man who collects_A for his own benefitB in privateC on his own (新概念英语）A private collector is a man who collects ( ).A:for his own benefit B:on his own C:in private D:unknown to the public 这道题是要根据原文的意思来选择跟原文符合的答案,原文是：this one must have been in the 这个猜一个成语是什么啊? 求几部men at play 的片子 谁有赶快给我啊~《Ready》 《Private Viewing》 《Private Viewing 2》 变间接引语;Did the young man say,"This is a private conversation!怎么是正确的.就是The young man said that that was a private conversation.用两个that吗?一个是宾语从句的,一个是this is 变的that 茼蒿炒鸡蛋 茼蒿怎么吃 茼蒿怎么吃?呵呵,除了吃火锅哟! 作文美好的人间感情短一些300字左右吧! 我们在引进外来物种时应注意哪些问题 几个首字母填空Not e( ) likes football.Happiness lies in love ,f( ) and peace.I missed UK and my r( ) during my stay in Beijing.The movie begins with a s( ) in a tall building. 小处不可随便 意思是什么 引进外来物种有什么益处!具体一点.要有具体例子. 从现在开始珍惜时间,20年以后会有什么收获 求一个书法家的故事,他的一张字条“不可随处小便”被人改成了“小处不可随便”,请详细一点. “小处不可随便”这条警句是什么意思?是由“不可随处小便”改变顺序来的. 这首歌的歌名叫什么呀?我只知道小部分歌词.《我用力往前飞再累也无所谓我知道你的光芒有多美.》歌词可能不对. His job is very meaningful .he is proud of himself同义句He is doing()()meaningful()()he is proud of himself 如何发展外来物种,引进的基础上的遗传变异. 这是什么?求介绍详细点,或者有什么作用 英语强调句型中是不是只能用that?it was the man who……行不行? dull pallor of her faceone of the gratings in the doorstheir gummy and fragrant leavesreceived the grace 英语演讲主题：时间.大哥哥大姐姐都帮一下忙.我现在初一,要一个英语演讲,最好带翻译.小妹感激不尽.（主题有关时间的,别的.也行吧） 急求~~英语演讲的题目~~谢啦~~~