CPU响应INTR引脚上来的中断请求的条件是（）
A.IF=0
B.IF=1
C.TF=0
D.TF=1
参考答案：B
He will have learned English for eight years by the time he ______ from the university next year.[ ]
A. will graduate
B. will have graduated
C. graduates
D. is to graduate
印度人口总数在2000年接近（）人。
A．10亿
B．11亿
C．10．5亿
D．8亿
