长株潭及周边城市房地产市场年报20xx年下(编辑修改稿)

长株潭及周边城市房地产市场年报20xx年下(编辑修改稿)内容摘要：

nd theory was correct but he needed evi dence. So when another outbreak hi t London i n 1845, he was ready to begi n hi s enqui ry. As the di sease spread qui ckl y through poor nei ghborhods, he began to gather i nformati on. In two parti cul ar streets, the chol era outbreak was so severe that m ore than 500 people di ed i n ten days. H e was determi ned to fi nd out why. Fi rst he m arked on a m ap the exact pl aces where al the dead peopl e had l i ved. Thi s gave him a val uabl e cl ue about the cause of the disease. Many of the deaths were near the water pum p i n Broad Street (especi al l y num bers 16, 37, 38 and 40) . H e al so noti ced that som e houses (such as 20 and 21 Broad Street and 8 and 9 Cam bri dge Street) had had no deaths. H e had not foreseen thi s, so he m ade further i nvesti gati ons. H e di scovered that these peopl e worked i n the pub at 7 Cam bridge Street. They had been gi ven free beer and so had not drunk the water from the pum p. It seem ed that the water was to bl am e. N ext, John Snow l ooked i nto the source of the water for these two streets. H e found that it cam e from the ri ver pol l uted by the di rty water from London. H e imm edi atel y tol d the astoni shed peopl e i n Broad Street to rem ove the handl e from the pum p so that i t coul d not be used. Soon afterwards the di sease sl owed down. H e had shown that chol era was spread by germs and not in a cloud of gas. In another part of London, he found suporti ng evi dence from two other deaths that were li nked to the Broad Street outbreak. A wom an, who had m oved away from Broad Stret, li ked the water from the pum p so m uch that she had i t deli vered to her house every day. Both she and her daughter di ed of cholera after drinki ng the water. Wi th thi s extra evi dence John Snow was abl e to announce with certainty that pol uted water cari ed the vi rus. To prevent thi s from happeni ng agai n, John Snow suggested that the source of al l the water suppl i es be exam i ned. The water pani es were i nstructed not to expose peopl e to pol l uted water any m ore. Fi nal y “Ki ng Chol era” was defeated. COPERNICUS’ REVOLUTIONARY TH EORY Ni col aus Coperni cus was fri ghtened and hi s mi nd was confused. Al though he had tri ed to i gnore them , al hi s m athem atical cal culati ons l ed to the sam e concl usi on: that the earth was not the centre of the sol ar system. O nl y i f you put the sun there di d the m ovem ents of the other pl as i n the sky m ake sense. Yet he coul d not tel anyone about hi s theory as the powerful Christian Church woul d have punished him for even suggesti ng such an i dea. They beli eved God had m ade the worl d and for that reason the earth was speci al and m ust be the centre of the sol ar system . The probl em arose because astronom ers had noti ced that som e pl as i n the sky seem ed to stop, m ove backward and then go forward i n the l oop. O thers appeared bri ghter at tim es and l ess bri ght at others. Thi s was very strange if the earth was the centre of the sol ar system and al pl as went round i t. Coperni cus had thought l ong and hard about these probl ems and tri ed to fi nd an answer. H e had col ected observati ons of the stars and used al hi s m athemati cal knowl edge to expl ai n them. But onl y hi s new theory coul d do that. So between 1510 and 1514 he worked on i t, gradual y im provi ng his theory until he fel t i t was pl ete. In 1514 he showed i t pri vatel y to his fri ends. The changes he m ade to the ol d theory were revol uti onary. H e placed a fi xed sun at the centre of the sol ar system wi th the pl as goi ng round i t and onl y the m oon sti l goi ng round the earth. H e also suggested that the earth was spi nning as i t went round the sun and thi s expl ai ned changes in the m ovem ent of the pl as and i n the bri ghtness of the stars. H i s fri ends were enthusi asti c and encouraged hi m to publ i sh his i deas, but Coperni cus was cauti ous. H e di d not want to be attacked by the Chri sti an Church, so he onl y publi shed i t as he l ay dyi ng i n 1543. Certai nl y he was ri ght to be careful . The Chri sti an Church rejected hi s theory, sayi ng i t was against God’s i dea and peopl e who supported it woul d be attacked. Yet Coperni cus’ theory i s now the basi s on which al l our i deas of the uni verse are bui l t. Hi s theory repl aced the Chri sti an i dea of gravity, whi ch sai d thi ngs tel l to earth because God created the earth as the centre of the uni verse. Coperni cus showed this was obvi ousl y wrong. Now peopl e can see that there i s a di rect l i nk between hi s theory and the work of Isaac N ewton, Al bert Ei nstei n and Stephen Hawki ng. Uni t 2 PUZZLES IN GEOGRAPH Y People m any wonder why di fferent words are used to descri be these four countri es: Engl and, Wal es, Scotl and and N orthern Irel and. You can cl ari fy thi s questi on i f you study Briti sh hi story. Fi rst there was Engl and. Wal es was li nked to i t i n the thirteenth century. N ow when peopl e refer to Engl and you fi nd Wal es i ncluded as wel l. N ext England and Wal es were joi ned to Scotl and i n the seventeenth century and the nam e was changed to “Great Bri tai n”. Happil y this was ac plished without confl ict when King James of Scotland becam e King of England and Wal es as wel l. Final ly the Engl ish government tried i n the early twenti eth century to form the Uni ted Kingdom by getti ng Ireland connected in the sam e peaceful way. However, the southern part of Ireland was unwil li ng and broke away to form its own government. So only Northern Irel and joi ned wi th England, Wal es and Scotland to be e the Uni ted Ki ngdom and this was shown to the worl d i n a new flag cal led the Union Jack. To thei r credi t the four countri es do work together in som e areas(eg, the curency and i nternational relations), but they stil l hav。