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
According to the passage, which of the following statement is true
A．A change in the educational system will eliminate the need to cheat.
B．The problem of student cheating has its roots in deeper problems.
C．Students do not cheat on essay tests.
D．Punishment is an effective method of stopping cheating.
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