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2000年1月四级考试阅读题：
Questions 36 to 40 are based on the following passage:
Why does dream go bad faster than butter? Some researchers think they have 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.
Cream and butter contain pretty much the same substances, so why cream should sour much faster has other. Both are emulsions----tiny globules(小球体)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 drift about in a sea of water. In butter, globules of a watery solution are locked away in a sea of fat. The bacteria which make the food go bad prefer to live 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 reversed, the bacteria are locked away in compartments(隔仓室) buried deep in the sea of fat. Trapped in this way, individual colonies cannot spread and rapidly run out of nutrients(养料). They also slowly poison themselves with their waste products. "In butter, you get a self-limiting system which stops the bacteria growing," says Brocklehurst .
The researchers are already working with food companies keen to see if their products can be made resistant to bacterial attack through alterations to the food's structure. Brocklehurst believes it will be possible 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
A) are more evenly distributed in cream
B) multiply more easily in cream than in butter
C) live on less fat in cream than in butter
D) produce less waste in cream than in butter
38. According to Brocklehurst, we can keep cream fresh
A) removing its fat C) reducing its water content
B) killing the bacteria D) altering its structure
39. The word " colonies" (Line 2, Para. 4) refers to
A) tiny globules C ) bacteria communities
B) watery regions D) little compartments
40. Commercial application of the research finding will be possible if salad 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 III Vocabulary and Structure
[此贴子已经被作者于2004-10-20 14:31:08编辑过] | 
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发表于 2004-10-20 14:06:00
楼主
哪个NN再来给我讲一遍啊 ，从来没有遇到过
