summaryzhen
1.I don't believe that _C__ can draw so well. A.a eight-year-old girl B.a girl of eight year C.a girl of eight D.an eight years old girl 2.Thirty-four _C__ three is a hundred and two. A.times B.time C.timed by D.times by 3.Tom has ___D books. A.two dozens B.dozen of C.dozens of D.two dozens of 4.There are _A__ flowers in the park . A. hundreds of thousands of B.hundreds and thousand C.hundred of thousand of D.hundreds and thousands of 5.Tom has spent a large _C__ of money on his new house . A.piece B.number C.amount D.deal 6.The price of that type of computer has been reduced___C_ . A.on 15 percentt B.by percent of 15 C.by 15 percent D.by 15 percents 7.There are _A__ of visitors to Kunming . A tens of thousands B.about ten of thousands C.about three thousands D.about three thousand 8.They have produced _A__ gain this year as they did in 2007. A.twice as much B.as twice much C.twice as many D.as twice many 请大家把选择正确答案的原因解释一下，越详细越好，回答好的还要追加悬赏分，十分感谢！提问者： 野红柳 - 见习魔法师 二级
气球飞哇
一般而言有1.无性生殖——类型和例子；2.嫁接——原理、形式（选择、判断）3.植物的有性生殖——传粉（大题）4.昆虫的发育过程（选择、图）——各个阶段的发育过程、发育名称5.dna是主要的遗传物质（大题）6.遗传性状——遗传图解（重点中的重点）7.人的性别决定8..生男生女的概率（重点）9.遗传病——常见例子、近亲结婚的危害、优生优育10.生物变异——可遗传、不可遗传常见的例子（选择、判断）11.运动的能量直接来源：atp（记住这句话）12.动物的行为——（选择）（觅食行为：防御行为：生殖行为：求偶（如孔雀开屏、青蛙鸣叫）、占区、筑巢、交配、孵卵、育雏、哺乳。迁徙行为：家燕南飞、秋季落叶昆虫冬眠、鱼类洄游社群行为：蚂蚁、蜜蜂等群体生活的动物在群体生活中的各种联系行为）
莫奈小兔
1.C ——当中间有连字符连接时，必须用单数形式 2.C ——timed by / multiplied by 乘以... 3.C ——我核实过字典了，你的答案有误吧？ dozen用法类似hundred，后接of时才会出现复数形式，前面有具体数字限定时不能接of，且必须为单数形式 4.A ——hundreds of thousands of 数十万的，固定搭配 hundred and thousands.（装饰蛋糕的）珠子糖 hundreds and thousands 撒在糕饼上做装饰的蜜饯 5.C ——a large amount of 大量，固定搭配 a piece of 表示一张(片,块,...) number、deal 与great 搭配 6.C ——percent是不可数名词 7.A ——tens of thousands of 固定搭配，表千百万 thousand 只有在接of时才会出现复数形式，单数形式时不能接of 8.A ——XX是XX的两倍，twice as much as 是固定用法
