“The closer the country was to Chernobyl, the stronger the effect，” said study co­author Hagen Scherb, a biostatistician(生物统计学家)at the German Research Center for Environmental Health in Munich.

　　More males were born relative to females in Belarus—Ukraine’s neighbour－than in France.

　　The study is based largely on Cold War­era statistics, but the findings are highly relevant to how gender could be affected after future nuclear disasters.

　　And in the wake of Japans Fukushima Daiichi nuclear power plant accident, experts are predicting another baby boy boom could come, especially on the U．S. West Coast.

　　Previous radiation experiments on animals may give a clue for the increase in male births. Tests showed that radiation caused damage to the X chromosome (染色体) in sperm, Dr. Scherb said.

　　A human sperm cell contains either an X or Y chromosome, while an egg only has an X chromosome. An XY combination will become a boy, while an XX combination will be a girl.

　　1. How many nuclear radiation accidents are mentioned in the passage?

　　A. 1.

　　B. 2.

　　C. 3.

　　D. 4.

　　2. Which of the following is true according to the passage?

　　A. The on­the­ground incidents like Chernobyl, affected birth gender across the globe.

　　B. There was an increase in the number of baby boys in Eastern European countries for several years after 1986.

【2016届高三英语（北师大版）一轮复习能力自评：Unit 20 New Frontiers20-3】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6 unit4《Global warming》

★ 备战2016年高考英语第一轮复习的七大方法

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修5 Unit 2 The United Kingdom

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修1 Unit 2 English around the world

★ 【浙江专用】2014届高考英语一轮复习课时作业(三十二)选修7Unit 2《Robots》

★ 2017届高考英语（江苏专用）二轮复习高考单词5大记忆法课件：4.联想记忆法

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修3 Unit 4 Astronomy：the science of the stars

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修7 unit3《Under the sea》

★ 四川省2016届高考英语一轮复习课时作业（30） Module 6 Animals in Danger 外研版必修5

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修6 unit3《A healthy life》