问题
单项选择题 A1型题
免疫组织化学染色间接法的特点是（）
A.将标记物标记在第一抗体上
B.将标记物标记在第二抗体上
C.同时标记第一抗体和第二抗体
D.特异性高，敏感性强
E.需要高浓度的第一抗体
答案
参考答案：B
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免疫组织化学染色间接法的特点是（）
A.将标记物标记在第一抗体上
B.将标记物标记在第二抗体上
C.同时标记第一抗体和第二抗体
D.特异性高，敏感性强
E.需要高浓度的第一抗体
参考答案：B
| Children’s literature traces its beginnings to preliterate times, when ancient storytellers passed tales and legends from generation to generation in the oral tradition. William Caxton, who established England’s first printing press, published books of etiquette, fables and legends. However, these didn’t constitute a body of work that could be considered literature for children. Because children at that time were considered "miniature adults", books were didactic in nature. The content for young readers consisted mainly of religious instruction, rules of behavior, ethical messages, and moral platitudes. In 1774, Englishman John Newberry changed children’s publishing when he began to create books with attractive formats, quality illustrations, and sturdy bindings, that were designed primarily for children to enjoy. The oldest, and most prestigious award given for children’s books published in America, is the Newberry Medal. In the following century, children’s literature began to bloom. Hans Christian Andersen’s wonderful stories like "The Ugly Duckling", and "The Little Mermaid", and Grimm brothers collected two volumes of German folktales that included stories such as "Snow White" and "Rumpelstiltskin". Childhood came to be recognized as a joyful and carefree period of life, and books celebrating it began to be published. Charles Dodgson (Lewis Carrol) wrote the fantasy "Alice in Wonderland", the first book that was intended purely for children’s enjoyment without any pretense of instruction. Edwards Lear’s books of nonsense poetry delighted both young and old readers. In North America, books for a young audience were becoming popular as well. Kate Douglas Wiggin wrote "Rebecca of Sunnybrook Farm", Louisa May Alcott wrote "Little Women", and Samuel Clemens (Mark Twain) created Tom Sawyer and Huckleberry Finn. By the end of the century, the pious and moralistic books of earlier times had been replaced by writing designed to amuse and entertain a young audience. In the 1800s color printing was introduced, and by the middle of the 19th century, the rough illustrations that characterized earlier children’s books had been replaced by works of art that captured the word and some of the story. |
What impact did color printing have on children’s books
A．Sales increased by the middle of the 19th century.
B．Rough illustrations were now more appealing.
C．Illustrations told more of the story and were more appealing.
D．Books became more amusing.