None of our early ancestors could digest milk as adults becau their bodies nev

题文

None of our early ancestors could digest milk as adults becau their bodies never had to ----milk drinking simply wasn’t an option. As people began to extract milk from animals, though, some people developed the ability to keep drinking it throughout their lives. Scientists now know of a milk-related mutation ( 变异) in our genes -- the chemical instructions for life that we carry in almost every cell in our bodies. People who have a mutated form of one particular gene can drink milk just fine. People without the mutation tend to get sick from milk. To figure out where, and possibly why, milk drinking started, some scientists have been looking at who has the milk-digesting mutation today. Patterns are striking. Most adults in Northern and Central Europe are able to digest milk -- and they do. Chee and butter and other dairy products are popular in countries such as Sweden, Denmark, Germany and England. Becau European ttlers dominated North America, most people here can handle milk just fine, as well. That may explain why ice cream is such a popular desrt in the United States. In much of Africa, Asia and South America, on the other hand, people tend to avoid dairy products becau they lead to diarrhea (腹泻) and other stomach problems. (That’s why you won’t typically find chee on the menu at a Chine, Japane or Ethiopian restaurant.) NativeAmericans are also unable to digest milk. bad on the genetic patterns, scientists have long thought that- milk drinking started inNorthern Europe, where dairy is an institution and the milk-digesting mutation is everywhere. A recent study painted a different picture. With a computer medal, Thomas and colleagues looked at the spread of the milk-drinking mutation, farming and other related factor. Working backward, the scientists concluded that the first milk-thinkers lived in Central Europe around what’s now Hungary about 7,500 years ago. The practice didn't start farther north, as scientists had thought before.66. Which of the following is the proper order of events according to the passage? a. Their children were able to digest milk as adults. b. They got sick from the milk. c. Some people got a mutation in their genes. d. Some people tried drinking milk from animals. e. Some people started to drink milk from animals on a regular basis. A. c→d→b→e→a   B. d→e→b→c→a  C. d →b→e→c→a   D. e→d→b→c→a 67. Most people in the USA can digest milk becau __________. A. they have strong stomachs  B. their ancestors were Europeans C. that’s where milk drinking stinted   D. farmers rai a lot of cows there68. Which of the following is LEAST likely to appear on the menu in a Japane restaurant?A. Butter.  B. Vinegar.  C. Fish.   D. Beef.69. Which of the following is the author most likely to agree with?A. Milk drinking first started in Northern Europe.B. Milk drinking first started in Central Europe.C. North American Indians were able to digest milk.D. Dairy products are very popular in North Korea.70. The main focus of the scientists' rearch was ______________. A. mutation of human genes   B. development of the human stomachC. why milk drinking started  D. where milk drinking first started 题型：未知难度：其他题型

答案

66-70 CBABD 

解析

略

考点

据考高分专家说，试题“None of our early an.....”主要考查你对 [健康环保类阅读 ]考点的理解。 健康环保类阅读

健康环保累阅读概念：

健康环保类文章常是介绍科学知识、生活常识和环境保护方面的短文。体裁有记叙文、 说明文、议论文和各种应用文。

健康环保类文章阅读技巧：

   健康环保类文章常是介绍科学知识、生活常识和环境保护方面的短文。阅读此类短文要以现象或事物为中心进行思考，理解现象产生的原因、条件和客观规律等。同时要抓住事物的特征、用途和相互关系等。科普环保类文章一般为说明文，从结构上看大致可分为三个部分：   第一部分一般是文章的首段，主要用来提出文章的主题，即文章想要阐述、说明的主要内容；   第二部分是文章的主体，可由若干个段落组成，对文章的主题进行展开说明；   第三部分是结尾段，对文章的主题进行归纳总结。这类文章多用一般现在时，而且一般多使用客观性词语表述。有时为了强调客观性，也常使用被动语态。   从近几年的考试题来看，科普环保类的文章越来越与人们的实际生活相接近。由于此类文章缺乏故事情节，很多同学对此类文章感到费解。但一般的科普类文章都是就事论事，需要逻辑推理和想象的时候较少，因此此类阅读题也没有同学们想象中的那么难，只要多加训练，就能较好地答题。【阅读策略】 1、概要(Summarizing)：  阅完材料后，将所阅材料浓缩，摘要，做出所阅材料的书面或口头梗概。 2、组织(Organization)：  阅读后根据阅读内容，识别观点、人物、事件之间的关系以及文章的结构关系。如：时间关系、比较或对比关系、相关关系及因果关系等。