His blood has since led to the development of a vaccine called Anti-D. After his blood type was discovered, Mr. Harrison volunteered to undergo a series of tests to help develop the Anti-D vaccine. “They insured me for a million dollars so I knew my wife Barbara would be taken care of,” he said. “I wasn't scared. I was glad to help. I had to sign every form going and basically sign my life away.”

　　Mr. Harrison is Rh-negative and was given injections of Rh-positive blood. It was found his plasma could treat the condition and since then it has been given to hundreds of thousands of women. It has also been given to babies after they are born to stop them developing the disease.

　　It is estimated he has helped save 2.2 million babies so far. Mr. Harrison is still donating every few weeks now.

　　56. What does the underlined phrase “two million” refer to?

　　A. mothers

　　B. babies

　　C. dollars

　　D. blood

　　57. Why did James decide to donate his blood? Because _____.

　　A. his daughter asked him to help her son

　　B. he has a golden arm worth a million dollars

　　C. a vaccine called Anti-D is to be developed

　　D. someone else’s blood saved his life

　　58. The sentence “The disease creates an incompatibility between the mother's blood and her unborn baby's blood” (underlined in Paragraph 5) suggests that _____.

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