单项选择题

The possible mason for hundreds of airport employees being arrested might be one of the following except ______.

A．using false ID
B．helping others in smuggling
C．being in the US illegally
D．denying or not mentioning past crimes
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单项选择题
Figures showed that security screeners were ______ dangerous items.
A．able to detect
B．not able to detect
C．not effective in detecting
D．very effective in detecting
单项选择题
Which one is NOT true according to the passage
A．All the passengers are supposed to go through security checks.
B．All the airport workers are supposed to go through security checks.
C．All the flight crews are supposed to go through security checks.
D．Not all the federal officials are, supposed to go through security checks.
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