适合年龄
10岁左右
绘本简介
The spring and summer of 1953 was terrifying for parents in the United States. They braced themselves for the possibility of polio. Through his determination and unorthodox thinking, Jonas Salk developed a polio vaccine and children's lives were saved. Jonas Salk provides students an in-depth look into both Dr. Salk's life and his search for the vaccine. The book can also be used to teach students the elements of a biography and the proper use of hyphenated compound adjectives. The book and lesson are also available for levels Z1 and Z2.
1953 年的春天和夏天对于美国的父母来说是可怕的。 他们为小儿麻痹症的可能性做好了准备。 通过他的决心和非正统的思维，乔纳斯·索尔克开发了脊髓灰质炎疫苗，挽救了儿童的生命。 Jonas Salk 让学生深入了解 Salk 博士的生平和他对疫苗的探索。 这本书也可以用来教学生传记的要素和连字符复合形容词的正确使用。 这本书和课程也适用于级别 Z1 和 Z2。
RAZ有严密的分级体系：根据全文词汇数、高频词词汇数与比例、低频词词汇数与比例、句子长度、句子复杂度、句式、插图信息量、思想深度、主题等多个角度，将整个阅读体系分为aa，A-Z共27个级别。
RAZ旨在帮助孩子找到适合孩子水平的级别，通过在同一级别下的大量阅读逐步提高孩子的阅读能力。
RAZ按难度分为27个级别，AA—C这4个级别对应幼儿园阶段; D—J这7个级别对应美国小学一年级;K—P这6个级别对应美国小学二年级;Q—T这4个级别对应美国小学三年级;U—W这3个级别对应美国小学四年级;X—Z对应美国小学五六年级(相当于国内高中毕业)。
