什么是化学反应

急@@提高英语新概念有用吗?求助啊..为了提高英语水平,用新概念行么?具体的要怎么用啊...是当听力材料来精听然后背诵还是当阅读材料做课后的题目然后把内容吃透呢?先谢谢各位了...回答 英译汉2：what lucky numbers have brought请翻译,并请回答问题 内神外鬼 LUCKY NUMBERS怎么样 write a composition on the topic My Friend and I have Different Ways of Coping with Stress ．You should write at least 150words. 4月26日 百度首页 电路灯泡是什么含义? 今天在百度的首页上面为什么会出现一个灯泡? remind sb of +从句 与remnd sb+从句的区别 用except这个单词写个句子. 英语；为什么是keep us informed?不是keep sb doing? inform sb 后可接疑问词引导的从句.keep me informed 后加疑问词引导的从句要加of inform sb 后的从句都是宾语从句，后可直接跟that 从句和疑问词引导的从句，如：Hiis letter informed us how and when he was e The strike causing so much violence and trouble finally ended after both sides reached an argeement.为什么是causing而不是had caused? The robot just was too much trouble.请问这里的trouble是名词还是形容词?too much 不是用来形容名词的吗?为什么前面会有was? hockey是什么意思?这是一个单词 street 要求说出中文解释,词性,以及音标! hockey是什么意思啊?求你的! hockey什么意思 用chang和except各造一个句子 Pls advise the cost for DEXP to door. except可以放在句首吗? the noise kept me awake.为什么不可以waking the noise from my neighbor interrupt me.The noise went on哪里有错并改正 Don't use my computer,myfather warned me ( 变为间接引语) 哪些单词后加a little,a few.好像有四个.only,still,quite, he sells the computer ( )his brother My brother failed 填介词 getting his licence all at once与all of a sudden有何区别能够举例给与说明吗? be looking 后接动词的什么形式 look fordward to后面是动词的什么形式 well my h____ is so strange that only i can read I made so many changes in my composition that only I could read it.I made so many changes in my composition that only I could read it.To ___ else ,it was hard to make out.1.none 2.anyone 3.someone 4.everyone as though用法she stood there still as though _______（turn）to a stone.她站在那里好像面对着一块石头.这里用turning还是turned还是别的.Waiting for her husband to come back,the middle-aged woman stood there still as though ____ though 的用法she stared angrily at her boss and turned away,as though _____out of the office.A to go B went C gone D would go注解说是as though she were to go out of the office.的省略.但我还是不明,为什么不定要be to do as though