题目内容：
Twenty-nine percent of US adults had hypertension
A．during the 1999-2004 period B．during the 1988-2004 period
C．during the 1994-1999 period
D．during the 1988-1994 period
参考答案：
答案解析：
单选题：Twenty-nine percent of US adults had hypertension
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B．during the 1988-2004 period
C．during the 1994-1999 period
D．during the 1988-1994 period