A) the freedom and convenience provided on trains
B) the practical aspests of travel
C) the adventurous aspects of train trips
D) the safety and cleanliness of train trips
34. The train ads were placed among family - oriented TV programs involv ing nature
and America because ______ .
A) they could focus on meaningful travel experiences
B) they could increase the effectiveness of the TV programs
C) their profits could be increased by some 15 percent
D) most travel - lovers and nervous fliers were believed to be among the audiences
35. According to the passage，the Empire Builder enjoyed an increase in ridership and
profits because ______ .
A) the attractiveness of its name and route was effectively advertised
B) it provided an exciting travel experience
C) its passengers could enjoy the great western outdoors
D) it was widely advertised in newspapers and magazines in Chicago and Seattle
Questions 36 to 40 are based on the following passage:
Why does cream go bad faster than butter? Some researchers think they the answer，and it comes down to the structure of the food，not its chemical composition - a finding that could help rid some processed foods of chemical preservatives.C ream and butter contain pretty much the same substances，so why cream should sou r muchfaster has been a mystery.Both are emulsions - tiny globules(小球)of one liquid evenly distributed throughout another.The difference lies in what's in the globules and what's in the surrounding liquid，says Brocklehurst，who led the investigation.In cream，fatty globules and what's in the surround ing liquid，says Brocklehurst，who led the investigation.In cream，fatty globul es drift about in a sea of water.In butter，globules of a watery solution are l ocked away in a sea of fat.The bacteria which make the food go bad prefer to li ve in the watery regions of the mixture."This means that in cream，the bacteria are free to grow throughout the mixture，"he says.When the situation is revers ed，the bacteria are locked away in compartments (密封仓) buried dee p in the sea of fat.Trapped in this way，individual colonies cannot spread and rapidly run out of nutrients.They also slowly poison themselves with their wast e products."In butter，you get a self - limiting system which stops the bacteri a growing，"says Brocklehurst.The researchers are already working with food com panies keen to see if their products can be made resistant to bacterial attack t hrough alterations to the food's structure.Brocklehurst believes it will be pos sible to make the emulsions used in salad cream，for instance，more like that in butter.The key will be to do this while keeping the salad cream liquid and not turning it into a solid lump.
36. The significance of Brocklehurst's research is that ______ .
A) it suggested a way to keep some foods fresh without preservatives
B) it discovered tiny globules in both cream and butter
C) it revealed the secret of how bacteria multiply in cream and butter
D) it found that cream and butter share the same chemical composition
37. According to the researchers.cream sours faster than butter because bacteria_____ .
A) are more evenly distributed in cream
B) multiply more easily in cream than is butter
C) live on less fat in cream than in butter
D) produce less waste in cream t han in butter
38. According to Brocklehurst，we can keep cream fresh by ______ .
A) removing its fat B) killing the bacteria
C) reducing its water content D) altering its structure
39. The word"colonies"(Line 2，Para.4) refers to ______ .
A) tiny globules B) watery regions
C) bacteria communities D) little compartments
40. Commercial application of the research finding will be possible if s alad cream
can be made resistant to bacterial attack ______ .
A) by varying its chemical composition B) by turning it into a solid lump
C) while keeping its structure unchanged D) while retaining its liquid form
Part ⅢVocabulary and Structure(20 m inutes)
Directions: There are 30 incomplete sentences in this part.For each sentence there are four choices marked A)，B)，C) and D) .Choose the ONE answer that best completes the sentence.Then mark the corresponding letter on the Anwer Sheet with a single line through the centre.
41. She ought to stop work；she has a headache because she ______ too long.
A) has been reading B) had read C) is reading D) read
42. Niagara Falls is a great tourist ______ drawing millions of visitors every year.
A) attention B) attraction C) appointment D) arrangement
43. I don't mind ______ the decision as long as it is not to
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