B. National hatred.
C. Family income planning.
D. Street accident. 49. We can learn from the passage that the two talk shows ____.
A. have become the only ones of its kind
B. exploit the weaknesses in human nature
C. appear at different times of the day
D. attract different people
50. What is the advantage of the Jerry Springer show?
A. The show exposes the dark sides of society.
B. The show pours poisonous waste into society.
C. Jerry sums up the whole idea of the show.
D. Jerry talks abou the improvement of society.
C
Can people change their skin colour without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin colour.
The gene comes in two versions, one of which is found in 99 per cent of Europeans. The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.
Scientists have changed the colour of a dark-striped zebrafish to uniform gold by inserting a version of the pigment(色素) gene into a young fish. As with humans, zebrafish skin colour is determined by pigment cells, which contain melanosomes(黑色素). The number, size and darkness of melanosomes per pigment cell determines skin colour.
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