单项选择题

Why did officials appear more worried about the terror alert this time

A．Because the raise of terror alert was in the seasonal festivities this time.
B．Because it was the fifth time to raise the terror alert to code orange.
C．Because terror alert would be kept at this level for a period of time.
D．Because officials in the Department of Defense all agreed on the decision.
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In this passage the author really concerns ______.
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B．the necessity of ensuring the traffic safety
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