“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.

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