设AL=7FH，要使AL=80H，应使用下列哪一条指令。
AND AL，80H
B. OR AL，80H
C. XOR AL，80H
D. NOT AL
查看答案
指令NOT AX，BX是合法的。
A. 对
B. 错
What does the passage tell us about the significance of the Olympic Games?
A. They are the world’s most important athletic events and mark the friendship among people of the world.
B. They not only provide exciting sporting events but alsomake great contributions to world peace.
C. They allow people of the world to enjoy most important athletic events and bring great economic benefit to the host sponsor country.
This passage introduces the five most popular, most _________, most revenue- __________ or most ________ sports in America.
Where were the first Olympics of modern times held?
A. In Rome.
B. In Cairo.
C. In Athens.
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