Variant 1 You could have come first and won the race if you … faster

27. Both water pollution and hydro-electric dam projects …

A) may separate dolphin population from one another. B) can be harmful for only fish species.

C) are causing the extinction of dolphins. D) are necessary for Chinese and Amazonian dolphins.
Born in Lincoln, Lincolnshire, on Nov. 2, 1815, George Boole was the son of a tradesman and was largely self-taught. He began teaching at the age of 16 to support his family. In his spare time, he read mathematical journals and soon began to write articles for them. By the age of 29, Boole had received a gold medal for his work from the British Royal Society. His “Mathematical Analysis of Logic”, published in 1847, contained his first statement of the principles of symbolic logic. Two years later he was appointed professor of mathematics at Queen`s College in Ireland, even though he had never studied at a university. He died in Ballin temple, Ireland, on Dec. 8, 1864.