题目

下列实验现象描述正确的是                                            A．红磷燃烧产生大量的白雾 B．铁丝在空气中燃烧，火星四射，生成黑色固体 C．硫在氧气中燃烧，产生淡蓝色火焰，生成有刺激性气味的气体     D．过氧化氢溶液中滴加硫酸铜溶液会有大量气泡生成 答案：DA very strict officer was talking to some new soldiers whom he had to train. He had never seen them before, so began, “My name is Stone, and I’m even harder than stone, so do what I tell you or there’ll be trouble. Don’t try any tricks (诡计) with me, and then we’ll get on well together.”     Then he went to each soldier one after the other and asked him his name, “Speak loudly so that everyone can hear you clearly,” he said, “and don’t forget to call me ‘sir’.”     Each soldier told him name, until he came to the last one. This man remained silent, and so Captain Stone shouted at him, “ when I ask you a question, answer it! I’ll ask you again: What’s your name, soldier?”     The soldier was very unhappy, but at last he replied, “My name’s Stonebreaker, sir,” he said nervously (紧张地). 51. The officer was strict _________.    A. because the soldiers were new.     B. with any of his soldiers, new or old.    C. because he was named Stone.      D. only when he was before soldiers. 52. According to what the officer said, _______________.    A. obeying his orders would sometimes bring no trouble.    B. trouble would come if anybody made tricks.    C. he always got on well with his soldiers.    D. he often had trouble with his soldiers. 53. The last soldier remained silent because _______________.    A. he didn’t like the way the officer spoke to them.    B. he wanted to see what would happen if he disobeyed his order.    C. the question was difficult for him to answer.    D. he was afraid the officer would be angry when he heard his name. 54. According to the officer, how to answer the question, “How old are you?”    A. (sadly) Twenty, sir.           B. (clearly) Twenty.    C. (loudly)Twenty, sir           D. (quickly)Ten years younger than you, sir