完型填空(共20小题；每小题2分，满分40分)　　
阅读下列短文，掌握其大意，然后从36～55各题的四个选项(A，B，C和D)中选出能填入相应空白处的最佳选项。并将答案写在答题卡上。
Shopping habits in the United Stateshave changed greatly in the last quarter of the 20th century. 　36  in the 1900s most American towns and cities had a Main Street .Main Street was always in the heart of a town. This street was 37  on both sides with many 38  businesses. Here, shoppers walked into stores to look at all sorts of merchandise: clothing, furniture, hardware, groceries. 39   ,some shops offered 40   .These shops included drugstores, restaurants, shoe-repair stores, and barber or hairdressing shops. 　41 in　 the 1950s, a change began to 42  .Too many automobiles had crowded into Main Street 43  too few parking places were 44  shoppers. Because the streets were crowded, merchants began to look with interest at the open spaces 45  the city limits. Open space is what their car-driving customers needed. 　　
And open space is what they got 46  the first shopping centre was built. Shopping centres, or rather malls, 47  as a collection of small new stores 48  crowded city centres. 49  by hundreds of free parking space, customers were drawn away from 50  areas to outlying malls. And the growing 51  of shopping centres led 52   to the building of bigger and betterstocked stores. 53   the late 1970s,many shopping malls had almost developed into small cities themselves. In addition to providing the 54   of one stop shopping, malls were transformed into landscaped parks, 55   benches, fountains, and outdoor entertainment.　　
36.A.As early as     B. Early  C. Early as     D. Earlier　　
37.A.built       B.designed      C.intented       D.lined　　
38.A.varied    B.various C.sorted  D.mixed up　　
39.A.Apart from    B.However     C.In addition  D.As well　　
40.A.medical care  B.food    C.cosmetics    D.services　　
41.A.suddenly B.Abruptly     C.Contrarily   D.But　　
42.A.be taking place      B.take place     C.be taken place       D.have taken place　　
43.A.while     B.yet       C.though D.and then　　
44.A.available for  B.available to  C.used by       D.ready for　　
45.A.over       B.from    C.out of  D.outside　　
46.A.when      B.while   C.since    D.then　　
47.A.started    B.founded      C.set up   D.organized　　
48.A.out of     B.away from   C.next to D.near　　
49.A.Attracted       B.Surprised    C.Delighted    D.Enjoyed　　
50.A.inner      B.central C.shopping     D.downtown　　
51.A.distinction     B.fame    C.popularity   D.liking　　
52.A.on   B.in turn C.by turns      D.further　　
53.A.By  B.During C.In D.Towards　　
54.A.cheapness      B.readiness     C.convenience D.handiness　　
55.A.because of     B.and      C.with     D.provided