63. What is the main idea of Paragraph 1?
A. The breast milk from an infected mother doesn’t contain HIV at all.
B. It’s less likely for infants feeding on infected mothers’ breast milk to catch HIV.
C. The possibilities of infants catching HIV have nothing to do with infected mothers.
D. Children breastfed by infected mothers won’t catch HIV though exposed to it frequently.
64. Why did the researchers divide breast milk into smaller fractions?
A. To find out Tenascin C. B. To make up specific proteins.
C. To add them to a tissue culture. D. To test what prevents cells being infected.
65. Which of the following about Tenascin C is true?
A. It has become an effective tool in fighting HIV.
B. It was first found by Permar and her research group.
C. It can prevent transmission in a live animal effectively.
D. It can sometimes prevent mother-to-child transmission of HIV.
66. What can we know about Permar and her research group according to the passage?
A. They have found a cure for HIV.
B. They have helped change UN guidelines.
C. They will do more researches on Tenascin C.
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