单项选择题


A．late
B．past
C．present
D．future
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单项选择题
A．improvingB．increasingC．raisingD．decreasing
A．improving
B．increasing
C．raising
D．decreasing
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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