颜回好学

现在还生活在地球上的恐龙或相似恐龙的生物只要是就行 地球上生存过的生物最大的是不是恐龙?发现过的恐龙最大的有多少吨? 彩虹的七种颜色各有什么寓意啊 恐龙诞生以前的地球适合人类居住吗?也就是说,假如有时间机器,把我们带回到2亿3千年前,人类能在2亿3前年前的生存环境中生存吗?当时地球的氧气充足吗?能满足人类最基本的呼吸需求吗?当 鲨鱼比恐龙哪个最先诞生在地球上? 常温下将150ml28%的NaNO3溶液加100g蒸馏水后,溶液中溶质的质量分数为14%,求原溶液 宇宙飞船以周期为T绕地地球作圆周运动时,由于地球遮挡阳光,会经历“日全食”过程,如图所示.已知地球的 宇宙飞船以周期为T绕地球作圆周运动时,由于地球挡光,会经历日全食,已知地球的半径为R,地球质量为M,引力常量为G,地球自转周期为T,太阳光可看作平行光,航天员在某点撤出的地球张角为a求 世界上什么恐龙最笨? 月球绕地球做圆周运动 地球绕太阳做圆周运动 月球绕太阳做什么运动?话说这是一个狠变态的问题.回答出来就能拿诺贝尔奖了. 最聪明的恐龙是哪种?最聪明的恐龙是那一种? 飞船环绕地球做圆周运动时,飞船的运动状态保持不变, 什么恐龙是最笨的? 高中英语单选,希望有解析1. What you need is more ____, for you are always doing your ____ at your desk.A. exercises; exercises B. exercise; exerciseC. exercises; exercise D. exercise; exercises2. I don’t think he could have done such a st 1.when you get the paper back ,pay special attention to what _____.A have marked B have been marked C had marked D had been marked 3道高中英语单选.1.There A a trend that 3D films will become more popular ever since the film Avatar hit the market．A．has arisen B．arose C．is arising D．will arise2.—You didn’t take the high-speed train with the leading letter "G" It is been years _________ I enjoyed myself so much as last night 这个为什么要用since 不用before?完全说不通啊.________ the protective glasses when you begin the experiment .please这个为什么要用wear?该用非谓语啊. the purpose of this attack is to weaken the economy of these countries and ----- the foundations of the industrial countries' economiesA widen B sharpen C strengthen D deepen选C ,我看不懂But I think we're making life worse for ourselves,------un I wonder ______ Jack didn't hurt himself jumping over that wall.That's strange!A.that B.how C.if D.whether 问几个高中英语单选 1.The research is so designed that once _____nothing can be done to change it.A.begins B.having begun C.beginning D.begun2.I would appreciate_____back this afternoon.A.you to call B.you call C.your calling D.you're calling ．—Why,Jack,you look so tired!---Well,I _____the house and I must finish the work tomorrow．A．was painting B．will be painting C．have painted D．have been painting 地球是怎么孕育生命的?恐龙比人类更早出现在地球,那最初的恐龙是以怎样的形式诞生在地球的?一个蛋么? 据说是略恐怖的故事但表示智商不够看不懂 麻烦您解释下,1.Not until the last day of the summer holidays_______that the happy time was coming to an end.A.realized B.did I realize C.have I realized D.I have realized2.-What do you think of the work Jack has done recently?-I feel______that 英语：“奶奶又卧病在床,需要人照顾”用英语怎么说 我的爸爸妈妈出差要到下个礼拜回来,奶奶又卧病在床,需要人照顾. “父母不在家,奶奶卧病在床”“和明天我要和玛丽去钓鱼”用英语怎么说? 英语翻译 父母出差,怎么用英语表示啊? 高手帮忙估一下2010年12月的英语六级分数!听力选择对11个,填词对4个,句子有一个写完整了,另一个少了一点,还有一个写了一半快速阅读只错了两个选择,填空都写了,完全原文照抄的,最多有点 命题“如果三角形有一个内角是钝角,则其余两个内角都是锐角”的逆命题是_____________,它是___命题 请高手帮我估下09年12月六级分数快速阅读6个,听力23个,阅读总共9个,完型4个,翻译3个,写作一般