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Point is its unpredictability:You could bag a sccond-hand bargain,or spend hours sifting (through inexpensive goods.21.What is special abouit Borough Market?A.Its excellent food.B.Its convenient location.C.Its length of open hours.D.Its range of goods.22.Which day is the best day for most markets?A.Monday.B.Tuesday.C.Saturday.D.Sunday.23.If you want to find something unexpected,which market should you go?A.Borough Market.B.Broadway Market.C.Portobell Road Market.D.Brick Lane MarketGeorge Shull was born in 1874 on a farm in Clark County,Obio,and his knowledge of plants andhybrids came at an early age.Being needed on the farm,Shull received his early formal education offand on.However,it was supplemented (by intense home study so that by 1892,he was teachingin a public school,and later attending Antioch College.In 1901,he graduated fromAntioch and went to the University of Chicago to do graduate work.With his knowledge of botany and experience with farming practices,Shull passed a Civil Service exam,and was appointed as a botanical assistant at the U.S.National Herbarium.He also worked at the U.S.Bureau of Plant Industry as a botanical expert examining the plants and animals of Chesapeake Bay andCurrituck Sound.The data hecollected during this time was to comprise his Ph.D.thesis.And in 1904he was appointed to be in charge of plant work at the Station for Experimental Evolution.He began working on corn in 1905.Following Gregor Mendel's example,Shull obtained purebred(纯种的)lines of corn through self--pollination(自花受粉).The pure-bred lines were less healthy andproductive,but when he crossed the pure-bred lines,the hybrid yields were better than any of the parentsor those pollinated in the open fields.He immediately recognized the potential for using this strategy toimprove crop yields:.yea:nse yhe ii:g飞：sIn 1915,Shull accepted a professorship at Princeton University.With his encouragement,PrincetonUniversity Press began the publication of a new journal,Genetics.Shull was the managing editor for tenyears.Genetics is still one of the top international science journals.Shull retired in 1942.He and his iwife spent most of their later years with their children andgrandchildren.24.What does the underlined part "off and on"in Paragraph I mean?A.Not surprisingly.B.Very formally.C.Very excellently.D.Not regularly25.What's Paragraph 2 mainly about?A.George Shull's contributions.B.George Shull's research.高二英语期末试题-4-（共10页）