According to the passage,what is considered as bad luck?
A. Walking under a ladder.
B. Dreaming of a black cat.
C. Hanging a mirror in the house.
D. Stepping on one’s own shadow.
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Why is it considered bad luck to see a black cat crossing one's path?
A. Because black cats look like witches.
Because black cats were thought to be witches.
C. Because black cats bring seven years of bad luck.
D. Because black cats arc hard to notice in darkness.
According to the passage,what will bring people good luck?
A. Breaking a mirror on purpose.
B. Catching a falling leaf on one’s birthday.
C. Finding a penny on the ground and picking it up.
Dreaming of blowing out the candles in one blow.
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基础设施即服务(IaaS),指消费者通过Internet从云计算中心获得完美的计算机基础设施服务,例如虚拟主机、存储服务等。下列哪项不属于基础设施资源?
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