单项选择题

Kelley’s publicists abruptly______a planned seven-city publicity tour, announcing that their "publishing objectives have been accomplished".

A．called off
B．called down
C．called up
D．called for
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单项选择题
HIV and AIDS may threaten the fundamental values of society, and any attempt to deal with them presents a______challenge.
A．formidable
B．fatal
C．favorable
D．fantastic
单项选择题
The______of emotional and psychiatric disorders that can prompt a person to seek therapy is wide.
A．formula
B．coverage
C．interval
D．spectrum
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