单项选择题

According to the latest report, consumer confidence ______ a breathtaking 15 points last month, to its lowest level in 9 years.

A．soared
B．mutated
C．plummeted
D．'fluctuated
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单项选择题
Some scientists have suggested that Earth is a kind of zoo or wildlife ______ for intelligent space beings, like the wilderness areas we have set up on earth to allow animals to develop naturally while we observe them.
A．conservation
B．maintenance
C．storage
D．reserve'
单项选择题
One can understand others much better by noting the immediate and fleeting reactions of their eyes and ______ to expressed thoughts.
A．dilemmas
B．countenances
C．concessions
D．junctions
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