单项选择题

Crowding as an environmental variable is only beginning to be seriously examined and the data so far is______.

A．informative
B．inconclusive
C．inconspicuous
D．indisputable
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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
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
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