单项选择题

When was the first case of AIDS reported.

A．1980.
B．1982.
C．1985.
D．1981.
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单项选择题
What does AIDS stand for
A．Acknowledged Immune Disable System.
B．Acquired Immune Deficiency Syndrome.
C．Acquired Impossible Disable System.
D．Acknowledged Impossible Deficiency Syndrome.
单项选择题
How long may the AIDS virus lie quietly inside the body' s cells before it burst forth
A．15 years.
B．20 years.
C．30 years.
D．lifelong.
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