题目内容

MCS系列单片机CPU关中断语句是()。

A. EA=1
B. ES=1
C. EA=0
D. EX0=1

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89C52单片机响应外部中断0的中断时,程序应转移到的地址是()。

A. 0003H
B. 000BH
C. 0013H
D. 001BH

The teacher raised his voice﹎﹍﹍﹍﹍ the students could hear him clearly.

A. when
B. so that
C. because
D. after

﹍﹍﹍﹍﹍he is old, he isvery strong.

A. Where
B. If
C. Although
D. Because

﹍﹍﹍﹍﹍John was watching TV , his wife was cooking.

A. While
B. unless
C. After
D. Before

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