do you have to give it to them? It's a hot­button legal question, but the short answer, for now, is yes. You could be criminally charged for refusing.

　　Say Just Enough

　　Unlike the police, who need "reasonable grounds"， customs officials can ask you anything. To cooperate, aim for clear, direct and polite answers.

　　【解题导语】　本文就如何尽可能顺利地到达美国机场乘飞机给出了一些建议。

　　【长难句分析】　Since 2010，Canadian airports have used full­body scanners that show what's under clothing.

　　分析：这是一个复合句。that引导定语从句，在从句中充当主语，指代前面的full­body scanners；what引导宾语从句，作show的宾语。

　　译文：自2010年以来，加拿大机场已经使用全身扫描仪来显示衣服里面的东西。

　　1．How can you reduce your waiting time while getting through an airport?

　　A．By asking your friends to help you.

　　B．By finding the fastest line.

　　C．By avoiding planning your departure.

　　D．By giving 50 dollars to an airline official.

答案与解析：B　考查细节理解。根据Plan Ahead部分中的第一句和第二句"Minimize your wait by scheduling your departure to avoid rush hours such as weekend mornings.Some airports have more than one access point for security；do a quick­Internet search or ask an airline