题干

甲、乙两车间排放出的污水中分别含有大量且不同的4种离子,这些离子是Ag+、Ba2+、Fe3+、Na+、Cl、NO3、OH、SO42.经检测,甲车间的污水PH>7,则下列判断正确的是(  )

A:甲车间的污水中可能含有Ba2+

B:乙车间的污水中可能含有Na+

C:甲车间的污水中不可能含有SO42

D:乙车间的污水中一定含有Fe3+

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答案(点此获取答案解析)

D

同类题4

阅读下面的文段,回答后面问题。
                                                                                                 父亲的三句箴言
        ①父亲是位农民。他幼年失怙,家中贫穷,没有上过学,因而目不识丁。幸亏,“生活是本无字书,”他从生活中汲取了诸多人生经验和生活智慧,令我至今记忆犹新。
       ②30多年前的一个冬夜,父亲有事出门,母亲睡在牛屋里看牛。半夜里,窃贼把牛屋的后墙掏出一个大洞,偷走了牛。那时,牛是农家的“半边天”,耕地打场都指望着它。这下“半边天”塌了,母亲自责得吃不下饭。父亲回来,不但没怪她一句,反而微微一笑安慰她说:“不要气。大风刮走鸭蛋壳,财帛去了人安乐。”后来,父亲借钱又买了一头小牛。
       ③曾经,我家和二叔家共住一处老宅子。后来分家时,应一人一半,但二叔蛮不讲理地霸占了大半。父亲不和他争,母亲责怪他窝囊,他却淡淡一笑:“不要争。争名夺利是枉然,临死两手攥空拳。”过了几年,二叔因为和他儿媳妇争一点儿菜地,气出了脑溢血,匆匆离世。
       ④那年,父亲从集市上买回一棵核桃树栽在院子里,栽好之后摸着我的脑袋说:“桃三杏四梨五年,枣树栽上就卖钱。等着这棵核桃树给你结核桃吃吧。”可是,我在树下眼巴巴地盼望了好几年,却仍然一个核桃也没结。听人说,核桃树有公母之分,母的结果,公的不结果。年年失望惹得我一肚子怒火,我拿着一把锯子对父亲说:“这棵核桃树是公的吧?还不如锯掉算了!”父亲拿过我手中的锯子,呵呵一笑:“不要急。天地从容,万物从容。”
       ⑤我只好耐着性子又等了一年,它终于结出许多青青圆圆的核桃。秋天,核桃成熟了,敲破果壳,吃着清香的核桃仁,我想父亲的话是对的。天地从容,万物从容,人也要从容。
      ⑥如今,闲暇时,我爱细细品味父亲的这三句箴言。“不要气”,他教我做一个豁达乐观的人;“不要争”,他教我做一个宽容厚道的人;“不要急”,他教我做一个镇定从容的人。这三句箴言,虽然简短,却意义深远,每一次品味都促我反躬自省,让我受益匪浅。

同类题5

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Inspiration

    “Mama, when I grow up, I'm going to be one of those!” I said this after seeing the Capital Dancing Company perform when I was three. It was the first time that my1 took on a vivid form and acted as something important to start my training. As I grew older and was 2to more, my interests in the world of dance 3 varied but that little girl's dream of someday becoming a 4 in the company never left me. In the summer of 2005 when I was 18, I received the phone call which made that dream a 5I became a member of the company6 back to 1925.

    As I look back on that day now, it surely 7 any sense of reality. I believe I stayed in a state of pleasant disbelief8 I was halfway through rehearsals (排练) on my first day. I never actually9 to get the job. After being offered the position, I was completely10I remember shaking with excitement.

    Though I was absolutely thrilled with the change, it did not come without its fair share of 11. Through the strict rehearsal period of dancing six days a week, I found it vital to 12 up the material fast with every last bit of concentration. It is that extreme 13 to detail (细节) and stress on practice that set us 14.To then follow those high-energy rehearsals 15 a busy show schedule of up to five performances a day, I discovered a new 16 of the words “hard work.” What I thought was my physical 17 were pushed much further than I thought 18I learned to make each performance better than the last.

    Today, when I look at the unbelievable company that I have the great19 of being a part of, not only as a member, but as a dance captain, I see a 20 that has inspired not only generations of little girls but a splendid company that continues to develop and grow and inspires people every day to follow their dreams.