单项选择题

What effect does excessive positive ionization have on some people

A．They think they are mad.
B．They feel very tired.
C．They become violently sick.
D．They are too tired to do anything.
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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
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.
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