单项选择题


A．attainments
B．feasibility
C．entertainments
D．evolution
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单项选择题
A．reviewsB．referencesC．reactionsD．recommendations
A．reviews
B．references
C．reactions
D．recommendations
单项选择题
A high negative ion count is likely to be found ______.
A．near a pond with a water pump
B．close to a slowly flowing river
C．high on some barren mountains
D．near a fountain
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