单项选择题

In this passage the author really concerns ______.

A．the ethical behavior we need in the world
B．the necessity of ensuring the traffic safety
C．the relation between traffic accidents and ethics
D．who should take the responsibility for unsafe
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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.
单项选择题
What can we infer from Para. 4
A．Americans were much concerned about and well prepared for the possible threat.
B．Nuclear plants were the most important places that need protection.
C．Washington, DC would be perfectly safe under the protection of surface-to-air missiles.
D．These protective methods will make Americans less worried about the possible treat.
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