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生物体内在有DNA和RNA的情况下,为什么只能DNA作为遗传物质? 所有生物体都是以DNA或RNA 作为遗传物质么? This is your book.My is on the desk. DO you go to school every day?的意思 Do you go to school every day?的回答是什么? 见到逗号后面一定跟which吗 翻译句子 how do you go to school every day?还有一个 in china,many people like to ride bikes.but each year many of them get hurt in bike accidents because they don't know enough about the rules of riding bikes. 这个which后面有没有逗号?the primary role of government which is to protect its citizens 因逗号误判which(1) If a book is in English,_____ means slow progress for you.A.as B.which C.what D.that(2) When I say two hours,_____ includes time for eating.A.as B.which C.what D.that两道题都选D,我就不懂为啥不用which呢? 动物每天吃什么? do you like math? no,it's __ difficult for me to learn it. 有时候逗号后是in which 有时是in what,但如果前面是介词只能用what么?这怎么看句子成分?怎么看用 which 还是 what那OF WHICH OF WHAT呢? in which 前面可以加逗号么?这句话用in which还是where好?The program first drew my eyes in the 2010 rankings published by US News and World Report,in which it was ranked 4th in graduate programs in the nation.用in which还是where好? If I had a lot of money,I'd travel all over the world,because I( )to achieve my dream.A.want B.wanted 填哪个 请说原因 《再见了,亲人》 续写300字 the math problem is _____ difficult for me ____ solve在变2个同义句 I thank math is a Iitte difficult for me （改为同义句） 求帮忙去一个有关wu琮琪名字的男生英文名,最好带有谐音的!急用! Holl Wu这个英文名怎么样,可以这样起吗,我本名叫wu hao 能不能帮忙取个英文名,最好是谐音,听起来顺口书写漂亮的.wu xing tao 英语语法：Someone has been here.为什么不是in hereSomeone has been in my office.这里为什么又要有in? 英语语法：Solitude can be hard to discover _____it has been given up.A. though B. until C. once D. before选哪个,为什么? 初中英语语法has been和had been的区别 岳飞和戚继光对中华的最大贡献是什么 岳飞李成梁戚继光这三人各有什么特点?岳飞与李戚二人相比,有什么优点和缺点? 岳飞的英雄事迹 岳飞和戚继光有什么相同点与不同点 My dream is （ ）around the worldMy dream is （ ）around the world 用travel填空 民族英雄戚继光的名言是 民族英雄戚继光的历史主要是关于戚继光效力的一篇小短文,不要多也不要太少,大概100多左右的字吧!急 快 为什么说戚继光是我国的民族英雄 为什么说戚继光是我国古代的民族英雄?