单项选择题

The word "ambivalent'(Line 1, Para. 2) refers to" ______ ".

A．positive
B．contradictory
C．satisfactory
D．negative
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单项选择题
According to the passage, U.S.-VISIT is a program in which ______.
A．people coming from other countries must be digitally photographed
B．only tourists are needed to leave their fingerprints at the airports
C．S. visitors have to deposit their passports with the local police
D．the governance places are only restricted to the airports
单项选择题
The word piecemeal'(Line 5, Para. 2).can be best replaced by ______ .
A．a part
B．gradually
C．a piece
D．immediately
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