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
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单项选择题
The expression scratch the surface most probably means ______.
A．think hard in a puzzled way
B．deal with a problem thoroughly
C．treat a subject without being thorough
D．work out a solution for a problem easily
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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