【正文】 and the gi ant cl am hal f buri ed in som e coral wai ti ng for som ethi ng to swim i n between its thi ck green l i ps. Then there were two grey reef sharks, each about one and a hal f m etres l ong, whi ch suddenl y appeared from behi nd som e coral . I tol d myself they weren’t dangerous but that di dn’t stop me from feeli ng scared to death for a m om ent! The water was quite shal ow but where the reef ended, there was a steep drop to the sandy ocean floor. It marked a boundary and I thought I was very brave when I swam over the edge of the reef and hung there looki ng down i nto the depths of the ocean. My heart was beating wil dly I fel t very exposed in such dep clear water. What a wonderful, l imi tless worl d it was down there! And what a tiny spot I was in thi s enormous world! Unit 4 A LETTER H OME Dear Rosem ary, Thanks for your l etter, whi ch took a fortni ght to arri ve. It was wonderful to hear from you. I know you’re dyi ng to hear al l about m y l i fe here, so I’ve i ncl uded som e photos whi ch wi l l hel p you pi cture the pl aces I tal k about. You asked about m y hi gh school . Wel l , i t’s on 6April , 1992, when he di ed as a result of an HIV i nfecti on that he had got from a bl ood transfusi on ni ne years earli er. When Asi m ov was three, he m oved wi th hi s parents and hi s oneyearol d sister to N ew York Ci ty. There hi s parents bought a candy store whi ch they ran for the next 40 or so years. At the age of ni ne, when hi s m other was pregnant wi th her third chi l d, Asim ov started worki ng parttim e i n the store. H e hel ped out through his school and universi ty years unti l 1942, a year after he had gai ned a master’s degree i n chemi stry. In 1942 he joined the staff of the Phi ladel phi a N avy Yard as a juni or chemi st and worked there for three years. In 1948 he got his PhD i n chem istry. The next year he becam e a bi ochemi stry teacher a Boston Uni versi ty School of Medici ne. In 1958 he gave up teachi ng to be e a ful tim e wri ter. It was when Asim ov was el even years ol d that hi s tal ent for writi ng becam e obvious. H e had tol d a fri end two chapters of a story he had wri ten. The fri end thought he was retel li ng a story from a book. Thi s real l y surpri sed Asi m ov and from that mom ent, he started to take him sel f seri ousl y as a writer. Asi m ov began havi ng stori es publ i shed i n sci ence fi cti on m agazi nes i n 1939. In 1950 he publi shed his fi rst novel and i n 1953 hi s fi rst sci ence book. Throughout hi s l i fe, Asim ov recei ved m any awards, both for hi s sci ence ficti on books and hi s sci ence books. Am ong hi s m ost fam ous works of sci ence ficti on, one for whi ch he won an award was the Foundati on tril ogy (19511953), three n。 and the gi ant cl am hal f buri ed in som e coral wai ti ng for som ethi ng to swim i n between its thi ck green l i ps. Then there were two grey reef sharks, each about one and a hal f m etres l ong, whi ch suddenl y appeared from behi nd som e coral . I tol d myself they weren’t dangerous but that di dn’t stop me from feeli ng scared to death for a m om ent! The water was quite shal ow but where the reef ended, there was a steep drop to the sandy ocean floor. It marked a boundary and I thought I was very brave when I swam over the edge of the reef and hung there looki ng down i nto the depths of the ocean. My heart was beating wil dly I fel t very exposed in such dep clear water. What a wonderful, l imi tless worl d it was down there! And what a tiny spot I was in thi s enormous world! Unit 4 A LETTER HOME Dear Rosemary, Thanks for your letter, whi ch took a fortnight to arrive. It was wonderful to hear from you. I know you’re dyi ng to hear al l about my l ife here, so I’ve included some photos whi ch wi l hel p you pi cture the pl aces I talk about. You asked about my high school. Wel , it’s 萬(wàn)頭 肉牛 育肥 示范園區(qū) 建設(shè)項(xiàng)目 可行性研究報(bào)告 on 6April , 1992, when he di ed as a result of an H IV i nfecti on that he had got from a bl ood transfusi on ni ne years earli er. When Asi m ov was thre, he m oved with hi s parents and his oneyearol d si ster to N ew York Ci ty. There hi s parents bought a candy store whi ch they ran for the next 40 or so years. At the age of nine, when hi s mother was pregnant with her thi rd chil d, Asim ov started worki ng parttim e i n the store. H e hel ped out through hi s school and uni versi ty years until 1942, a year after he had gai ned a m aster’s degree i n chem i stry. In 1942 he joi ned the staf of the Phil adel phia N avy Yard as a juni or chemi st and worked there for three years. In 1948 he got hi s PhD i n chem i stry. The next year he becam e a bi ochemi stry teacher a Boston Uni versi ty School of Medi ci ne. In 1958 he gave up teaching to be e a ful tim e wri ter. It was when Asim ov was el even years ol d that hi s tal ent for writi ng becam e obvious. H e had tol d a fri end two chapters of a story he had wri tten. The friend thought he was retel i ng a story from a book. This real y surpri sed Asim ov and from that m om ent, he started to take him sel f seri ously as a writer. Asim ov began havi ng stori es publ i shed i n sci ence fi cti on m agazi nes i n 1939. In 1950 he publ i shed hi s fi rst novel and i n 1953 hi s fi rst sci ence book. Throughout hi s li fe, Asim ov received m any awards, both for hi s sci ence ficti on books and hi s sci ence books. Am ong hi s m ost fam ous works of sci ence fi cti on, one for whi ch he won an award was the Foundati on tri l ogy (19511953), three novel s about the death and rebi rth of a great em pi re in a gal axy of the future. It was l osel y based on the fal l of the Rom an Em pi re but was about the future. These books are fam ous because Asi m ov i nvented a theoreti cal fram ework whi ch was designed to sh