37. The result of the search for an easily digestible fat turned out to be .

　　A) commercially useless

　　B) just as anticipated

　　C) somewhat controversial

　　D) quite unexpected

　　38. Olestra is different from ordinary fats in that .

　　A) it passes through the intestines without being absorbed

　　B) it facilitates the absorption of vitamins by the body

　　C) it helps reduce the incidence of heart disease

　　D) it prevents excessive intake of vitamins

　　39. What is a possible negative effect of olestra according to some critics?

　　A) It may impair the digestive system.

　　B) It may affect the overall fat intake.

　　C) It may increase the risk of cancer.

　　D) It may spoil the consumers' appetite.

　　40. Why are nutritionists concerned about adding vitamins to olestra?

　　A) It may lead to the over-consumption of vitamins.

　　B) People may be induced to eat more than is necessary.

　　C) The function of the intestines may be weakened.

　　D) It may trigger a new wave of fake food production.

　　Unit 2

　　21.B 22.A 23.C 24.C 25.D 26.C 27.B 28.A 29.D 30.A

　　31.B 32.C 33.A 34.D 35.B 36.D 37.D 38.A 39.C 40.B