单项选择题 Passage Four：Questions 36 to 40 are based on the following passage. Why does cram 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 been a mystery. 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.第36题：The significance of Brocklehurst’s research is that ________.A) it suggested a way to keep some foods fresh without preservativesB) it discovered tiny globules in both cream and butterC) it revealed the secret of how bacteria multiply in cream and butterD) it found that cream and butter share the same chemical composition

单项选择题 下列那一项是急性盆腔炎的典型表现（）

单项选择题 51～65 Importance of the Public Image Public image refers to how a company is viewed by its customers。suppliers,and stockholders(股东),by the financial community,by the communities in which it operates,and by the federal and local governments.Public image is controllable to a________ (1)extent,just as the product,price,place.and promotional efforts are. A firms public image________ (2)a vital role in the attractiveness of the firm and its products to employees,customers,________ (3)to such outsiders as stockholders,suppliers,creditors(债权人),government officials。as well as________ (4)special groups.With some things it is impossible to satisfy all the diverse publics：for example,a new highly automated plant may meet the________ (5)of creditors and stockholders,but it will undoubtedly find resistance from employees who see their________ (6)threatened.On the other hand,high-quality products and service standards should bring almost complete approval,________ (7)low quality products and false claims would be widely looked down upon. A firm's public image,________ (8)it is good,should be treasured and protected It is a________ (9)asset that usually is built up over a long and satisfying relationship of a film with its publics.If a form. has________ (10)a quality image, this is not easily countered or imitated by competitors.________ (11) an image may enable a firm to charge higher prices,to Woo(追求)the best distributors and dealers,to attract the best employees,to________ (12)the most favorable creditor relationships and lowest borrowing costs.It should also allow the firm's stock to command a higher price-earnings ratio than other firms in the same industry________ (13)such a good reputation and public image. A number of factors affect the public image of a corporation.________ (l 4)include physical facilities,contacts of outsiders with company employees,product quality and dependability, prices________ (15)competitors,customer service,the kind of advertising and the media and programs used,and the use of public relations and publicity. 第 51 题 请选择（1）处的最佳答案A．consistent B．considerable C．considerate D．free