单项选择题


A．late
B．half
C．rest
D．latter
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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 slow-flowing river
C．high in some barren mountains
D．by a rotation water sprinkler
单项选择题
People should be able to come to a decision about ions in the air if they _______.
A．note their own reactions
B．move to a healthier, area
C．observe domestic animals
D．watch how wealthy people behave
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