设函数f(1-3x)的定义域

i do not think teenagers should drive cars如何回答 i think teenagers should ______ drive.they are not serious enough1.be allowed to 2.not be allowed to 3.not allow to -----i do not think teenagers should drive cars,---（i agree）,they are not serious enough.怎么翻译,有无固定用法,或回答 . 关于祖国大好河山的诗句 英语翻译did you get much homework dun on the weekend?:) a number of paintings in the castle are believed___in a firebeing destroyedhaving been destroyedto be destroyedto have been destroyed a nimber of paintings in the castle are believeda number of paintings in the castle are believed___in a firebeing destroyedhaving been destroyedto be destroyedto have been destroyed选d The big fire in Shanghai,believed to_due to the burning of construction materials,caused 58 deaths and destroyed all the belongings of the people there.A.have occurredB.occurC.have been occurringD.be occurringB为什么不行 以及求所有选项的 1.the fire _in the furnace under the house A is believed to started Bthat they believed to start答原因是甚么 完形填空Mark Twain the famous American writer 文章的序言怎么写 描写祖国大好河山的好句3句好段3段!注：好句不要诗句!好段不要太长! ___,everything would have been all right.A.he had been here B.here he had been C.ebbn herehe hadD.had he been here 讲清楚点 over the weekend与on the weekend的区别! 缅甸字怎么写 缅甸 使用什么文字 文章的序怎么写 长清景观湖内有什么鱼想找个时间去景观湖钓鱼.不知道景观湖的情况.跪求长清景观湖的情况介绍.里面都有什么鱼?什么鱼居多?哪一块地方钓鱼比较理想.里面有大鱼吗?谢谢Q329866829 园林景观工程用的到鱼类吗园林景观工程中会用得到鱼类吗,如果用得到,都有什么鱼类 Everything has gone我分手了,她说另她非常失望边上网边流泪从没有过 everything has gone为什么everything在前面 Everything has gone的中文意思是? Everything has gone to Everything has gone to hurt Everything has gone to hurt 在氯化钠提纯时,为什么用毒性很大的氯化钡,而不用无毒性的氯化钙来除硫酸根离子 五水硫代硫酸钠和硫代硫酸钠有什么不同 请问这是什么鱼,怎么烧?这家伙死了一个小时还能动,吓死我了'''这鱼值多少钱. 五水硫代硫酸钠有毒吗? 为什么有的鱼烧出来有柴油味? 鱼的高产量现象的原因长期遗传和变异的结果一种适应性受非生物因素制约的结果适应的相对性 鱼怎么烧好吃 The population of China is 1.3 b___