单项选择题

During his two-month stay in China, Tom never ______ a chance to practice his Chinese.

A．passed on
B．passed up
C．passed by
D．passed out
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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
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
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