单项选择题

What does the passage tell us about rainfall in the desert

A．It never rains.
B．It rains so little that nothing can live.
C．It rains unexpectedly.
D．It rains very infrequently.
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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
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
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