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  3. Why did officials appear more worried about the terror alert this time? What can we infer from Paragraph 4?

Why did officials appear more worried about the terror alert this time? What can we infer from Paragraph 4?

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问题 Why did officials appear more worried about the terror alert this time?
What can we infer from Paragraph 4?
选项 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.
答案A
解析 第四段主要介绍了针对可能发生的恐怖袭击美国所采取的一些安全防卫措施。他们加强了核工厂、港湾和其它可能遭受袭击的目标的安全防卫。在华盛顿地区部署了地对空导弹。根据这些可以推断出美国人对可能发生的恐怖袭击很担忧而且做了充分的准备。核工厂是最重要的、最需要保护的地方，只是这段提到防卫措施一个方面，不是从这段整体意思要推断出的意思，故可排除B；文中未提及在地对空导弹的保护下华盛顿地区万无一失(be perfectly safe)，故可排除C，根据本段不能推断出这些安全防卫措施可以使美国人对于可能发生的恐怖袭击不那么担忧，故可排除 D。
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