1） try （2） _try1231 （3） $Try_* （4） 4_try （5） #_try （6） $try_1_for 2. 以下哪些变量的声明是合法的：

表达式"123"+"1"的计算结果是"1231"

1、11、21、1211、1231、131221、然后呢?

求满足条件xyz+zyx=1231的所有x、y、z

Try——ColbieCaillat Putyourmakeupon Getyournailsdone 1yourhair Runtheextramile Keepit2sotheylikeyou, dotheylikeyou? Getyoursexyon 3,girl Takeitoff Thisiswhatyouwant,tobelong, sotheylikeyou Doyoulikeyou? Youdon'thavetotrysohard Youdon'thaveto,giveitallaway Youjusthavetogetup,getup,getup,getup Youdon'thavetochange4 Youdon'thavetotry,try,try,try Youdon'thavetotry,try,try,try Youdon'thavetotry,try,try,try Youdon'thavetotry Youdon'thavetotry Getyourshoppingon, atthemall, maxyour5 Youdon'thavetochoose,buyitall,sotheylikeyou Dotheylikeyou? Waitasecond, Why,shouldyoucare,whattheythinkofyou Whenyou'reallalone,byyourself,doyoulikeyou? Doyoulikeyou? Youdon'thavetotrysohard Youdon'thaveto,giveitallaway Youjusthavetogetup,getup,getup,getup Youdon'thavetochangeasinglething Youdon'thavetotrysohard Youdon'thavetobenduntilyoubreak Youjusthavetogetup,getup,getup,getup Youdon'thavetochangeasinglething Youdon'thavetotry,try,try,try Youdon'thavetotry,try,try,try Youdon'thavetotry,try,try,try Youdon'thavetotry Youdon'thavetotry,try,try,try Youdon'thavetotry,try,try,try Youdon'thavetotry,try,try,try Youdon'thavetotry， Youdon'thavetotry Youdon'thavetotrysohard Youdon'thaveto,giveitallaway Youjusthavetogetup,getup,getup,getup Youdon'thavetochangeasinglething Youdon'thavetotry,try,try,try Youdon'thavetotry,try,try,try Youdon'thavetotry Youdon'thavetotry Takeyourmakeupoff letyourhairdown 6 Lookintothe7,atyourself Don'tyoulikeyou? CauseIlikeyou

执行下列程序段后，输出结果是 A: 1204 B: 1504 C: 1231 D: 1531

Many people _________ lose weight and never __________. A: manage to; try to B: try to; manage to C: try to; try doing D: try to do; manage

为企业开通结算中心的交易是（） A: 1233 B: 1231 C: 1289 D: 1261

We are going to _____________ the new machine. A: try B: try on C: try out D: try our best

We should _____ all the equipment before setting up the experiment. A: try for B: try out C: try on D: try into