题目

以下是某同学记录的实验操作或现象，其中操作正确或者现象符合事实的是（） A . 镁条在空气中燃烧，产生白色火焰，生成黑色固体 B . 实验室制取氧气时，检查装置的气密性后再加入药品 C . 为加快过滤速度，用玻璃棒搅拌滤纸上的悬浊液 D . 红磷在空气中燃烧，产生大量白色烟雾 答案：BDo Americans have morals? That’s a good question. Moral values in America are like those in any 36  .One of the most 37 moral values for Americans is honesty. The well-known 38 about George Washington and the cherry tree teaches this value  39  .Little George cut down his father’s favorite cherry tree  40   trying out his new hatchet. When his father asked him about it, George said, “I cannot tell a lie. I did it with my hatchet.” Instead of  41  ,George received praise. Sometimes American honesty-being open and direct-can   42   people. But Americans still believe that “honesty is the best policy.”Another   43   Americans respect is perseverance(毅力）.Remember Aesop’s fable about the turtle and the rabbit that had a   44  ?The rabbit thought he could  45   easily, so he took a nap. But the turtle finally won because he did not   46  .Compassion(同情）may be the queen of American virtues. The story of “The Good Samaritan” from the Bible   47  a man who showed compassion. On his way to a   48  city, a Samaritan man found a poor traveler lying on the road. The kind Samaritan,   49  just passing by, stopped to help this person in need. Compassion can even turn into a positive  50  .In autumn 1992, people in Iowa sent truckloads of water to help Floridians   51  by a hurricane. The next summer, during the Midwest flooding, Florida   52  the favor.In no way can this brief description   53  all the moral values honored by Americans. Courage, responsibility,   54  , gratitude and many others could be discussed. But no matter how long or how short the list, moral values are   55  . 36．A．continentB．characterC．contentD．culture37．A．lovelyB．basicC．particularD．scientific38．A．novelB．jokeC．legendD．music39．A．politelyB．clearlyC．easilyD．slightly40．A．whileB．forC．whereasD．as41．A．agreementB．punishmentC．achievementD．argument42．A．puzzleB．injureC．interruptD．offend43．A．personB．actionC．virtueD．system44．A．quarrelB．raceC．fightD．trip45．A．winB．failC．defeatD．beat46．A．slow downB．come upC．give upD．fall off47．A．describesB．praisesC．tellsD．mentions48．A．lonelyB．aloneC．certainD．deserted49．A．inspire ofB．on account ofC．as a result ofD．instead of50．A．rowB．circleC．movementD．action51．A．hurtB．destroyedC．ruinedD．hit52．A．offeredB．returnedC．honoredD．reminded53．A．coverB．respectC．shapeD．reflect54．A．strengthB．silenceC．loyaltyD．reality55．A．invaluableB．honorableC．unbelievableD．invisible