单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．$ 18.
B．$ 19.
C．$ 20.
D．$ 22.
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填空题
The LAMV is 18 feet long, 10 feet wide, and 6 feet high and 2,200 pounds and can hold 4 passengers.
单项选择题
By saying no document is safe any more, the author probably means _____.
A．"affordable printers make it possible for anyone to forge documents
B．the American Secret Service will be able to trace any document
C．every printed document will be secretly marked out through high-tech
D．counterfeiters have more advanced technology to use
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