【正文】 especi al l y loved the l i tl e orange and white fi sh that hi d i n the wavi ng l ong thi n seaweed. And I al so l oved the sm al fi sh that cl ean the bodi es of l arger fi shI even saw them get i nsi de their m ouths and cl ean their teeth! It seem ed there was a surpri se wai ti ng for m e around every corner as I explored sm al caves, shel ves and narrow passages wi th m y underwater fl ashli ght: the yel l ow and green parrotfi sh was hangi ng upsi de down, and sucki ng ti ny pl ants off the coral wi th its hard bi rdl ike m outh。 a yel l owspotted red seaslug was sl i di ng by a bl ue seastar: a l arge wi sel oki ng turtl e was passi ng so cl ose to m e that I coul d have touched i t. There were other creatures that I di dn’t want to get too cl ose toan eel wi th i ts strong sharp teth, wi th onl y i ts head showing from a hol e, watchi ng for a tasty fi sh ( or m y tasty toe!)。 a yel l owspotted red seaslug was sl i di ng by a bl ue seastar: a l arge wi sel oki ng turtl e was passi ng so cl ose to m e that I coul d have touched i t. There were other creatures that I di dn’t want to get too cl ose toan eel wi th i ts strong sharp teth, wi th onl y i ts head showing from a hol e, watchi ng for a tasty fi sh ( or m y tasty toe!)。 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。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