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
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单项选择题
The author probably would agree with the point of view that _________.
A．Students who cheat should be expelled from school.
B．Parents alone must take responsibility for the rise in student cheating.
C．The educational system is sound, and students must follow every rule.
D．The educational system in this country would benefit from a thorough evaluation.
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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