Yet, these additives remain in our food, and it is difficult to know which things on the wrappings（包装）of foods are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin to their animals, and because of this, penicillin has been found in the milk of cows. Sometimes similar things are supplied to animals not for their health, but just to make a profit.

　　The farmers are simply trying to fatten the animals in order to get a higher price on the market. Although some countries have tried to control such things, the practice continues.

　　50. According to this passage, we can know      . 

　　  A. perhaps most of human illness is caused by what we eat

　　  B. perhaps most kinds of cancer are related to what people eat

　　  C. cancer was discovered in 1945

　　  D. science has made food unfit to eat

　　51. Things that are used to keep colours in meats are       .

　　  A. harmful      B. useless        C. helpless         D. dangerous

　　52. All the additives       .

　　  A. are bright and colourless          

　　  B. are not bright and colourful

　　C. have indirect effects on our health 

　　  D. have direct effects on our health

【2017届高考英语一轮总复习精选单元练习人教版必修4《Unit 4 Body language》】相关文章：

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修8 unit3《Inventors and inventions》

★ 【三维设计】2017届高考英语（江苏专用）二轮复习课件：必修3 Unit 3《Back to the past》

★ 备战2016年高考英语第一轮复习的七大方法

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 5 B卷 Word版含解析

★ 2017届高考英语二轮复习课时训练：23（含解析）

★ 2014届高考英语一轮复习必修4参考答案（外研版）

★ 2014届高考英语一轮复习课时作业(二十二)必修4Module 4《Great Scientists》（外研版）

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (75)

★ 2017届高考英语二轮复习大题冲关秘籍完形填空之记叙文：应试策略（含解析）

★ 2017届高考英语二轮复习书面表达限时测验：3（含解析）