题干

你将作业本递给Linda时会说:          

A:Here you are.

B:Yes, it is.

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答案(点此获取答案解析)

A

同类题3

阅读下列短文,从每题所给的A、B、C和D项中,选出最佳选项。

      Florence Nightingale was born in a rich family.When she was young she took lessons in music and drawing,and read a lot of books.She also travelled a great deal with her mother and father.

      As a child she felt that visiting sick people was both a duty and a pleasure.She enjoyed helping them.At last her mind was made up.“I’m going to be a nurse,” she decided.“Nursing isn’t the right work for a lady,” her father told her.

       “Then I will make it so,” she smiled.And she went to learn nursing in Germany and France.When she returned to England,Florence started a nursing home for women.

      During the Crimean War in 1854 she went with a group of thirty-eight nurses to the front hospitals.What they saw there was terrible.Dirt and death were everywhere to be seen and smelled.The officer there did not want any woman to tell him how to run a hospital,either.But the brave nurses went to work.

      Florence used her own money and some from friends to buy clothes,beds,medicines and food for the men.Her only pay was in smiles from the lips of dying soldiers.But they were more than enough for this kind woman.

      After war she returned to England and was honoured for her services by Queen Victoria.But Florence said that her work had just begun.She raised money to build the Nightingale Home for Nurses in London.She also wrote a book on public health,which was printed in several countries.

Florence Nightingale died at the age of ninety,still trying to serve others through her work as a nurse.Indeed,it is because of her that we honour nurses today.

同类题4

阅读下面选文,完成各题。

                                                                                             稀土扼住了谁的咽喉

    ①最近,稀土产量占世界总产量97%的中国,出于对环境保护和资源的可持续利用等方面的考虑,大幅度降低稀土的产量和出口,使得近两个月国际市场稀土交易价格上涨了30%。对此,美国、日本叫苦不迭。

    ②稀土到底为何物,能如此牵动日、美的神经?

    ③稀土其实是一系列元素的统称,包括铼、镧、镨、钕、钐、钇等。如果将石油比作“工业血液”的话,那么稀土就是“工业维生素”。别看总需求量不大,但离了它,合金、超导材料、微电子材料和激光设备等众多高科技产品都将成为“无米之炊”。特别是在材料方面,稀土元素加入一点即可收到“点石成金”的效果,将普通金属转化为特种合金。这些合金和电子产品除了民用销售外,更多是为军用而开发,能够为武器带来革命性突破。

    ④稀土元素铼与“太空金属”钛制成的钛铼合金,具有惊人的强度和硬度,可以用来制造一些处于极恶劣环境下的武器装备。冷战时期,前苏联用钛铼合金制造的M级核潜艇,艇身可抵抗1000多米深处海水的巨大压力(相当于100多个大气压),最大下潜深度更是深达惊人的1250米,而当时美军鱼雷的使用极限深度也只有800米。

    ⑤第四代战斗机翘楚“猛禽”F-22有45%的材料都采用稀土合金,最外面的机壳更是采用超强的稀土镁钛合金。另外,飞机尾部喷射管的火焰高达3000摄氏度以上,这个温度会令绝大多数金属熔化或变软,所以喷射管需要用到稀土制成的特种陶瓷,它能耐6000摄氏度的高温。

    ⑥在海湾战争中因多次成功截获“飞毛腿”导弹而崭露头角的“爱国者”导弹,它的制导系统使用了钐钴磁体和钕铁硼磁体用于电子束聚焦装置,该装置可以精确地追踪和定位目标导弹,直到锁定。“爱国者”的另一重要部件弹体控制飞翼也是由含有稀土元素的合金制成的,飞翼需要极高的强度和韧性,才能在高速飞行中保证方向的精准而不会折断。

    ⑦美军“陆战之王”坦克M1装备了含有稀土元素钕钇铝的石榴石激光测距机,在晴朗的白天能达到近4000米的瞄准距离,而伊军装备的前苏联T72坦克激光测距只有2000多米,在战斗中很多T72还没有瞄准M1就已经被对方摧毁。另外,M1坦克也是夜战好手,它装备了含有稀土镧元素的夜视仪,伊军坦克到了夜里就一摸黑,被动挨打。

    ⑧中国对稀土的出口控制,会令美国人为自己使用的高科技武器支付更多的美元,而日本人不仅仅失去了向美军销售高端电子产品的利润,也丧失了对邻国说“不”的资格。

(选自《意林》2011年第1期,有删改)