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
Educators are finding that students who cheat _________.
A．have poor academic records
B．use the information in late years .
C．can be academically weak or strong
D．are more likely to be punished than before
单项选择题
Which of the following statements reflects information in the selection
A．The educational system and its administrators are partly to blame for the rise in the cheating.
B．The student who cheats must be at fault because the system is correct.
C．The 1960s vision of changing the world led students to conform.
D．Punishment for cheaters has always been severe in this country.
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