76〜80 BDFAE
(杨浦)
A. Weather is to blame è
B. Divided opinions
C. Inheriting characteristics
D. Home of the redheads
E. Greater sensitivity to pain
F. Gene mutation
76.
Britain may be the most red-headed country in the world. About 1 to 2 percent of the world’s population has red hair, but in the UK the numbers are much higher, with 13 percent of Scots, 10 percent of the Irish, and 6 percent of people in England having red hair, according to the BBC.
77.
Scientists have tried to explain why some people have red hair for some time and now they may have found an answer: the dull weather in Britain. The human body needs vitamin D from sunshine, but unfortunately people living in Britain do not have enough of it because of its maritime climate. In fact, Britain gets even more cloud than countries in the far north of Europe. In Sweden, for example, the average daily hours of sunshine is 5.4. In Scotland it is only 3.1 hours.
78.
To deal with this, the DNA of people living in these areas has changed slightly; scientists call this a mutation. Originally, the coloring on our body is a mixture of two kinds of melanin — black melanin and red/yellow melanin, but with certain parts of DNA changed, the production of black melanin is suppressed while only red/yellow melanin is made. The result is red hair, light skin color, freckles and a greater sensitivity to sunlight.
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