单项选择题


A．improving
B．increasing
C．raising
D．decreasing
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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
单项选择题
A high negative inn 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
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