A．She is serving her guests.B．She is singing songs.C．She is working hard.D．Shc is look
A. She is serving her guests.
B. She is singing songs.
C. She is working hard.
D. Shc is looking at the city.
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Air Force One is a powerful diplomatic and political tool.
A. Y
B. N
C. NG
听力原文：M：I'd love to dance，but I don't know the steps．
W：It doesn't matter．No one will be looking at in this crowd．
Q：What does the woman mean？
(18)
A. No one knows how to dance.
B. No one will pay attention to how the man dances.
C. It's too crowded to dance.
D. No one is dancing there.
操作系统的作用时负责诊断机器的故障。
A. 正确
B. 错误
病毒传播不但能在单个计算机范围内进行，而且能够在计算机网络中进行。()
A. 正确
B. 错误
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