81. What made Bennink hypothesize the protective effect of orange juice?

1. The wide consumption of the fruits.
2. The citrus limonoids of the fruits.
3. His own personal experience.
4. His promising research.

82. Which of the following is true of the results of Bennink's study?

1. Only eight rats of the control group showed tumors.
2. Thirteen rats of the test group failed to show tumors.
3. Seventy-seven percent of the test group did not show tumors.
4. Only thirty-three percent of the control group showed tumors.

83. It can be inferred from the passage that Bennink ____.

1. won much financial support with his unexpected results
2. had a commercial intention in the first place
3. tried to please orange-juice manufacturers
4. found a right sponsor

84. Both Reddy and Lam ____.

1. seemed to be surprisingly impressed by Bennink's findings
2. did not seem to be surprised by Bennink's findings
3. did not seem to believe in the orange juice benefit
4. seemed to be doubtful of Bennink's findings

85. From the passage we can learn that scientists are still in the dark about ____.

1. the substance that suppresses tumors
2. the existence of bioavailability in the human body
3. the uptake of limonoids from orange-juice in people
4. the bioavailability of citrus compounds in the human body

(Reference keys.)