☆☆☆☆☆
简体网页||繁体网页



下载链接1
下载链接2
下载链接3

类似图书 点击查看全场最低价

---

编辑推荐

适读人群 ：8-12岁
When Laura Ingalls finds work as a teacher, Almanzo drives her to her family's home on the weekends--and Laura soon finds herself falling in love in this full-color collector's edition of this Newbery Honor Book.

内容简介

For the first time in the history of the Little House books, this new edition features Garth Williams' interior art in vibrant, full color, as well as a beautifully redesigned cover.

Fifteen-year-old Laura lives apart from her family for the first time, teaching school in a claim shanty twelve miles from home. She is very homesick, but keeps at it so that she can help pay for her sister Mary's tuition at the college for the blind. During school vacations Laura has fun with her singing lessons, going on sleigh rides, and best of all, helping Almanzo Wilder drive his new buggy. Friendship soon turns to love for Laura and Almanzo in the romantic conclusion of this Little House book.

作者简介

Laura Ingalls Wilder was born in 1867 in the log cabin described in Little House in the Big Woods. She and her family traveled by covered wagon across the Midwest. Later, Laura and her husband, Almanzo Wilder, made their own covered-wagon trip with their daughter, Rose, to Mansfield, Missouri. There, believing in the importance of knowing where you began in order to appreciate how far you've come, Laura wrote about her childhood growing up on the American frontier. For millions of readers Laura lives on forever as the little pioneer girl in the beloved Little House books.

前言/序言

These Happy Golden Years流金岁月 [平装] [8-12岁] 电子书 下载 mobi epub pdf txt

评分☆☆☆☆☆

读书对于不同的人有不同的乐趣，对于从事体力劳动来说，读书一种休闲；对于从事脑力劳动的人来说，

评分☆☆☆☆☆

质量很好，屯着慢慢看！

评分☆☆☆☆☆

纸张很好且为彩图版，很棒的版本。内容就不必说了，经典名著，买来收藏的，活动价格也很合适，总之非常满意，推荐购买！

评分☆☆☆☆☆

很好的图画书，给孩子读很好

评分☆☆☆☆☆

爸妈网推荐little house系列书

评分☆☆☆☆☆

质量很好，屯着慢慢看！

评分☆☆☆☆☆

它能净化人的心灵。每读到一本好书就像他乡遇故知、久旱遇甘霖一样，另人心旷神怡，

评分☆☆☆☆☆

小篆

评分☆☆☆☆☆

人们生活水平提高要求更多更好的新药，药物科学的发展为新药开发提供了理论基础和技术条件，市场经济竞争也促进了新药快速发展。美国食品与药物管理局(FDA)近十年来每年批准上市的新药都在20种以上。我国近年来引进新药品种很多，但需要加快创新。新药开发是一个非常严格而复杂的过程，各药虽然不尽相同，药理研究却是必不可少的关键步骤。临床有效的药物都具有相应的药理效应，但具有肯定药理效应的药物却不一定都是临床有效的药物。例如抗高血压药都能降低血压，但降压药并不都是抗高血压药，更不一定是能减少并发症、延长寿命的好药。因此新药开发研究必需有一个逐步选择与淘汰的过程。为了确保药物对病人的疗效和安全，新药开发不仅需要可靠的科学实验结果，各国政府还对新药生产上市的审批与管理制定了法规，对人民健康及工商业经济权益予以法律保障。 新药来源包括天然产物、半合成及全合成化学物质。过去选药主要方法是依靠实践经验，现在可以根据有效药物的植物分类学找寻近亲品种进行筛选或从有效药物化学结构与药理活性关系推断，定向合成系列产品，然后进行药理筛选。近年来对于机体内在抗病物质(蛋白成分)利用DNA基因重组技术，即将DNA的特异基因区段分离并植入能够迅速生长的细菌或酵母细胞，以获得大量所需蛋白药物。此外，还可对现有药物进行化学结构改造(半合成)或改变剂型，也可获得疗效更好，毒性更小或应用更方便的药物。

类似图书 点击查看全场最低价