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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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
单项选择题
Because the pandas had already been weakened by disease and drought, a harsh winter would have had______consequences for them.
A．preventive
B．regressive
C．catastrophic
D．moderate
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