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Dear Mr. Martin,
I want to thank you for the many k......

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单项选择题
Blood banks were slow to respond to the AIDS threat because ______.
A．they are heroic, altruistic organizations
B．they are nonprofit corporations
C．tighter screening forces them to discard more products, which means lost revenues
D．they are ignorant of the threat
单项选择题
Which of the following statements is TRUE
A．Red Cross Blood Services' fiscal 1985 revenue places it number 473 among the Fortune 500.
B．Engleman ' s blood bank was the first-known blood bank in the nation to adopt a blood screening test.
C．Engleman' s blood bank found AIDS directly.
D．Eckerk is the only one who feels blood banks responds slowly to AIDS threat.
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